メール一括送信ツール

クラス設計とコンストラクタ

App093クラスにアプリの全機能をまとめています。__init__でウィンドウ設定、_build_ui()でUI構築、process()でメイン処理を担当します。責任の分離により、コードが読みやすくなります。

import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import smtplib
import threading
import csv
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime


class App093:
    """メール一括送信ツール"""

    def __init__(self, root):
        self.root = root
        self.root.title("メール一括送信ツール")
        self.root.geometry("960x640")
        self.root.configure(bg="#1e1e1e")
        self._recipients = []    # [{"name": ..., "email": ..., "status": ...}]
        self._attachment = None
        self._build_ui()

    def _build_ui(self):
        header = tk.Frame(self.root, bg="#252526", pady=6)
        header.pack(fill=tk.X)
        tk.Label(header, text="📧 メール一括送信ツール",
                 font=("Noto Sans JP", 12, "bold"),
                 bg="#252526", fg="#4fc3f7").pack(side=tk.LEFT, padx=12)

        tk.Label(self.root,
                 text="⚠ 送信テストは必ずダミーメールサービス (Mailtrap等) で行ってください。",
                 bg="#fff3cd", fg="#856404", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X)

        # メインPaned
        paned = ttk.PanedWindow(self.root, orient=tk.HORIZONTAL)
        paned.pack(fill=tk.BOTH, expand=True, padx=4, pady=4)

        # 左: SMTP + 宛先
        left = tk.Frame(paned, bg="#1e1e1e", width=420)
        paned.add(left, weight=0)

        # SMTP設定
        smtp_f = tk.LabelFrame(left, text="SMTP設定", bg="#252526",
                                fg="#ccc", font=("Arial", 9), padx=6, pady=4)
        smtp_f.pack(fill=tk.X, padx=4, pady=4)

        fields = [
            ("SMTPサーバー",   "smtp_host", "smtp.gmail.com"),
            ("ポート",         "smtp_port", "587"),
            ("ユーザー名",     "smtp_user", "your@email.com"),
            ("パスワード",     "smtp_pass", ""),
            ("差出人名",       "from_name", "送信者名"),
        ]
        self._smtp_vars = {}
        for i, (label, key, default) in enumerate(fields):
            tk.Label(smtp_f, text=f"{label}:", bg="#252526", fg="#ccc",
                     font=("Arial", 9), width=12, anchor="e").grid(
                row=i, column=0, sticky="e", pady=1)
            v = tk.StringVar(value=default)
            self._smtp_vars[key] = v
            show = "*" if key == "smtp_pass" else ""
            ttk.Entry(smtp_f, textvariable=v, width=22,
                      show=show).grid(row=i, column=1, padx=4, pady=1, sticky="w")

        self.tls_var = tk.BooleanVar(value=True)
        tk.Checkbutton(smtp_f, text="TLS/STARTTLS を使用",
                       variable=self.tls_var,
                       bg="#252526", fg="#ccc", selectcolor="#3c3c3c",
                       activebackground="#252526").grid(
            row=len(fields), column=0, columnspan=2, sticky="w")

        # 宛先リスト
        tk.Label(left, text="宛先一覧", bg="#1e1e1e", fg="#888",
                 font=("Arial", 9)).pack(anchor="w", padx=4, pady=(8, 0))
        btn_row = tk.Frame(left, bg="#1e1e1e")
        btn_row.pack(fill=tk.X, padx=4)
        ttk.Button(btn_row, text="＋ 追加",
                   command=self._add_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="📂 CSVインポート",
                   command=self._import_csv).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="🗑 削除",
                   command=self._remove_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="全クリア",
                   command=self._clear_recipients).pack(side=tk.LEFT, padx=2)

        cols = ("status", "name", "email")
        self.rec_tree = ttk.Treeview(left, columns=cols, show="headings", height=10)
        self.rec_tree.heading("status", text="状態")
        self.rec_tree.heading("name",   text="名前")
        self.rec_tree.heading("email",  text="メールアドレス")
        self.rec_tree.column("status", width=60,  anchor="center")
        self.rec_tree.column("name",   width=100, anchor="w")
        self.rec_tree.column("email",  width=200, anchor="w")
        rsb = ttk.Scrollbar(left, command=self.rec_tree.yview)
        self.rec_tree.configure(yscrollcommand=rsb.set)
        rsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.rec_tree.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.rec_tree.tag_configure("sent",  foreground="#26a69a")
        self.rec_tree.tag_configure("error", foreground="#ef5350")

        # 右: メール本文
        right = tk.Frame(paned, bg="#1e1e1e")
        paned.add(right, weight=1)

        tk.Label(right, text="件名:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(anchor="w", padx=4)
        self.subject_var = tk.StringVar(value="お知らせ")
        ttk.Entry(right, textvariable=self.subject_var).pack(
            fill=tk.X, padx=4, pady=2)

        tk.Label(right, text="本文 ({name} で宛先名を差し込み):",
                 bg="#1e1e1e", fg="#ccc", font=("Arial", 9)).pack(
            anchor="w", padx=4)
        self.body_text = tk.Text(right, bg="#0d1117", fg="#c9d1d9",
                                  font=("Arial", 10), relief=tk.FLAT,
                                  insertbackground="white", wrap=tk.WORD)
        bsb = ttk.Scrollbar(right, command=self.body_text.yview)
        self.body_text.configure(yscrollcommand=bsb.set)
        bsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.body_text.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.body_text.insert("1.0",
                               "{name} 様\n\nいつもお世話になっております。\n\nよろしくお願いいたします。")

        # 添付ファイル
        att_row = tk.Frame(right, bg="#1e1e1e")
        att_row.pack(fill=tk.X, padx=4, pady=2)
        tk.Label(att_row, text="添付:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(side=tk.LEFT)
        self.att_var = tk.StringVar(value="(なし)")
        tk.Label(att_row, textvariable=self.att_var, bg="#1e1e1e",
                 fg="#888", font=("Arial", 9)).pack(side=tk.LEFT, padx=4)
        ttk.Button(att_row, text="ファイル選択",
                   command=self._pick_attachment).pack(side=tk.LEFT)
        ttk.Button(att_row, text="クリア",
                   command=lambda: (self.att_var.set("(なし)"),
                                    setattr(self, "_attachment", None))
                   ).pack(side=tk.LEFT, padx=2)

        # 送信ボタン
        btn_row2 = tk.Frame(right, bg="#1e1e1e", pady=4)
        btn_row2.pack(fill=tk.X, padx=4)
        tk.Button(btn_row2, text="📧 一括送信開始", command=self._send_all,
                  bg="#1565c0", fg="white", relief=tk.FLAT,
                  font=("Arial", 12, "bold"), padx=20, pady=6,
                  activebackground="#0d47a1", bd=0).pack(side=tk.LEFT)
        ttk.Button(btn_row2, text="🔧 接続テスト",
                   command=self._test_connection).pack(side=tk.LEFT, padx=8)

        self.progress = ttk.Progressbar(self.root, mode="determinate")
        self.progress.pack(fill=tk.X, padx=8)
        self.status_var = tk.StringVar(value="SMTP設定と宛先を入力してください")
        tk.Label(self.root, textvariable=self.status_var,
                 bg="#252526", fg="#858585", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X, side=tk.BOTTOM)

    # ── 宛先操作 ─────────────────────────────────────────────
    def _add_recipient(self):
        dlg = tk.Toplevel(self.root)
        dlg.title("宛先追加")
        dlg.configure(bg="#252526")
        dlg.grab_set()
        name_var  = tk.StringVar()
        email_var = tk.StringVar()
        for label, var in [("名前:", name_var), ("メール:", email_var)]:
            row = tk.Frame(dlg, bg="#252526")
            row.pack(fill=tk.X, padx=12, pady=4)
            tk.Label(row, text=label, bg="#252526", fg="#ccc",
                     width=8, anchor="w").pack(side=tk.LEFT)
            ttk.Entry(row, textvariable=var, width=26).pack(side=tk.LEFT)
        def _ok():
            n = name_var.get().strip()
            e = email_var.get().strip()
            if not e:
                return
            self._recipients.append({"name": n, "email": e, "status": "未送信"})
            self.rec_tree.insert("", tk.END, values=("─", n, e))
            dlg.destroy()
        ttk.Button(dlg, text="追加", command=_ok).pack(pady=8)

    def _import_csv(self):
        path = filedialog.askopenfilename(
            filetypes=[("CSV", "*.csv"), ("すべて", "*.*")])
        if not path:
            return
        try:
            with open(path, encoding="utf-8-sig", newline="") as f:
                reader = csv.DictReader(f)
                for row in reader:
                    name  = row.get("name", row.get("名前", ""))
                    email = row.get("email", row.get("メール", row.get("mail", "")))
                    if email:
                        self._recipients.append(
                            {"name": name, "email": email, "status": "未送信"})
                        self.rec_tree.insert("", tk.END,
                                              values=("─", name, email))
            self.status_var.set(f"インポート完了: {len(self._recipients)} 件")
        except Exception as e:
            messagebox.showerror("エラー", str(e))

    def _remove_recipient(self):
        for sel in self.rec_tree.selection():
            idx = self.rec_tree.index(sel)
            if idx < len(self._recipients):
                del self._recipients[idx]
            self.rec_tree.delete(sel)

    def _clear_recipients(self):
        self._recipients.clear()
        self.rec_tree.delete(*self.rec_tree.get_children())

    def _pick_attachment(self):
        path = filedialog.askopenfilename()
        if path:
            self._attachment = path
            self.att_var.set(os.path.basename(path))

    # ── SMTP ────────────────────────────────────────────────
    def _get_smtp(self):
        host = self._smtp_vars["smtp_host"].get()
        port = int(self._smtp_vars["smtp_port"].get())
        user = self._smtp_vars["smtp_user"].get()
        pwd  = self._smtp_vars["smtp_pass"].get()
        tls  = self.tls_var.get()
        s = smtplib.SMTP(host, port, timeout=10)
        if tls:
            s.starttls()
        if user and pwd:
            s.login(user, pwd)
        return s

    def _test_connection(self):
        self.status_var.set("接続テスト中...")
        def _do():
            try:
                s = self._get_smtp()
                s.quit()
                self.root.after(0, self.status_var.set, "接続テスト: 成功")
            except Exception as e:
                self.root.after(0, self.status_var.set, f"接続テスト: 失敗 - {e}")
        threading.Thread(target=_do, daemon=True).start()

    def _build_msg(self, recipient):
        from_name  = self._smtp_vars["from_name"].get()
        from_email = self._smtp_vars["smtp_user"].get()
        subject    = self.subject_var.get()
        body_tpl   = self.body_text.get("1.0", tk.END)
        body       = body_tpl.replace("{name}", recipient["name"])

        msg = MIMEMultipart()
        msg["From"]    = f"{from_name} <{from_email}>"
        msg["To"]      = recipient["email"]
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain", "utf-8"))

        if self._attachment:
            with open(self._attachment, "rb") as f:
                part = MIMEBase("application", "octet-stream")
                part.set_payload(f.read())
            encoders.encode_base64(part)
            part.add_header("Content-Disposition",
                             f'attachment; filename="{os.path.basename(self._attachment)}"')
            msg.attach(part)
        return msg

    def _send_all(self):
        if not self._recipients:
            messagebox.showwarning("警告", "宛先を追加してください")
            return
        if not messagebox.askyesno("確認",
                                    f"{len(self._recipients)} 件にメールを送信しますか？"):
            return
        self.progress["maximum"] = len(self._recipients)
        self.progress["value"]   = 0
        threading.Thread(target=self._do_send, daemon=True).start()

    def _do_send(self):
        ok = err = 0
        try:
            smtp = self._get_smtp()
        except Exception as e:
            self.root.after(0, self.status_var.set, f"SMTP接続失敗: {e}")
            return

        iids = self.rec_tree.get_children()
        for i, (rec, iid) in enumerate(zip(self._recipients, iids)):
            try:
                msg = self._build_msg(rec)
                smtp.sendmail(self._smtp_vars["smtp_user"].get(),
                               [rec["email"]], msg.as_string())
                rec["status"] = "送信済"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": ("✔", rec["name"], rec["email"]),
                                  "tags": ("sent",)})
                ok += 1
            except Exception as e:
                rec["status"] = f"エラー: {e}"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": (f"✘", rec["name"], rec["email"]),
                                  "tags": ("error",)})
                err += 1
            self.root.after(0, self.progress.configure, {"value": i + 1})

        smtp.quit()
        self.root.after(0, self.status_var.set,
                         f"送信完了: {ok} 件成功 / {err} 件失敗")


if __name__ == "__main__":
    root = tk.Tk()
    app = App093(root)
    root.mainloop()

UIレイアウトの構築

LabelFrameで入力エリアと結果エリアを視覚的に分けています。pack()で縦に並べ、expand=Trueで結果エリアが画面いっぱいに広がるよう設定しています。

import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import smtplib
import threading
import csv
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime


class App093:
    """メール一括送信ツール"""

    def __init__(self, root):
        self.root = root
        self.root.title("メール一括送信ツール")
        self.root.geometry("960x640")
        self.root.configure(bg="#1e1e1e")
        self._recipients = []    # [{"name": ..., "email": ..., "status": ...}]
        self._attachment = None
        self._build_ui()

    def _build_ui(self):
        header = tk.Frame(self.root, bg="#252526", pady=6)
        header.pack(fill=tk.X)
        tk.Label(header, text="📧 メール一括送信ツール",
                 font=("Noto Sans JP", 12, "bold"),
                 bg="#252526", fg="#4fc3f7").pack(side=tk.LEFT, padx=12)

        tk.Label(self.root,
                 text="⚠ 送信テストは必ずダミーメールサービス (Mailtrap等) で行ってください。",
                 bg="#fff3cd", fg="#856404", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X)

        # メインPaned
        paned = ttk.PanedWindow(self.root, orient=tk.HORIZONTAL)
        paned.pack(fill=tk.BOTH, expand=True, padx=4, pady=4)

        # 左: SMTP + 宛先
        left = tk.Frame(paned, bg="#1e1e1e", width=420)
        paned.add(left, weight=0)

        # SMTP設定
        smtp_f = tk.LabelFrame(left, text="SMTP設定", bg="#252526",
                                fg="#ccc", font=("Arial", 9), padx=6, pady=4)
        smtp_f.pack(fill=tk.X, padx=4, pady=4)

        fields = [
            ("SMTPサーバー",   "smtp_host", "smtp.gmail.com"),
            ("ポート",         "smtp_port", "587"),
            ("ユーザー名",     "smtp_user", "your@email.com"),
            ("パスワード",     "smtp_pass", ""),
            ("差出人名",       "from_name", "送信者名"),
        ]
        self._smtp_vars = {}
        for i, (label, key, default) in enumerate(fields):
            tk.Label(smtp_f, text=f"{label}:", bg="#252526", fg="#ccc",
                     font=("Arial", 9), width=12, anchor="e").grid(
                row=i, column=0, sticky="e", pady=1)
            v = tk.StringVar(value=default)
            self._smtp_vars[key] = v
            show = "*" if key == "smtp_pass" else ""
            ttk.Entry(smtp_f, textvariable=v, width=22,
                      show=show).grid(row=i, column=1, padx=4, pady=1, sticky="w")

        self.tls_var = tk.BooleanVar(value=True)
        tk.Checkbutton(smtp_f, text="TLS/STARTTLS を使用",
                       variable=self.tls_var,
                       bg="#252526", fg="#ccc", selectcolor="#3c3c3c",
                       activebackground="#252526").grid(
            row=len(fields), column=0, columnspan=2, sticky="w")

        # 宛先リスト
        tk.Label(left, text="宛先一覧", bg="#1e1e1e", fg="#888",
                 font=("Arial", 9)).pack(anchor="w", padx=4, pady=(8, 0))
        btn_row = tk.Frame(left, bg="#1e1e1e")
        btn_row.pack(fill=tk.X, padx=4)
        ttk.Button(btn_row, text="＋ 追加",
                   command=self._add_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="📂 CSVインポート",
                   command=self._import_csv).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="🗑 削除",
                   command=self._remove_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="全クリア",
                   command=self._clear_recipients).pack(side=tk.LEFT, padx=2)

        cols = ("status", "name", "email")
        self.rec_tree = ttk.Treeview(left, columns=cols, show="headings", height=10)
        self.rec_tree.heading("status", text="状態")
        self.rec_tree.heading("name",   text="名前")
        self.rec_tree.heading("email",  text="メールアドレス")
        self.rec_tree.column("status", width=60,  anchor="center")
        self.rec_tree.column("name",   width=100, anchor="w")
        self.rec_tree.column("email",  width=200, anchor="w")
        rsb = ttk.Scrollbar(left, command=self.rec_tree.yview)
        self.rec_tree.configure(yscrollcommand=rsb.set)
        rsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.rec_tree.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.rec_tree.tag_configure("sent",  foreground="#26a69a")
        self.rec_tree.tag_configure("error", foreground="#ef5350")

        # 右: メール本文
        right = tk.Frame(paned, bg="#1e1e1e")
        paned.add(right, weight=1)

        tk.Label(right, text="件名:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(anchor="w", padx=4)
        self.subject_var = tk.StringVar(value="お知らせ")
        ttk.Entry(right, textvariable=self.subject_var).pack(
            fill=tk.X, padx=4, pady=2)

        tk.Label(right, text="本文 ({name} で宛先名を差し込み):",
                 bg="#1e1e1e", fg="#ccc", font=("Arial", 9)).pack(
            anchor="w", padx=4)
        self.body_text = tk.Text(right, bg="#0d1117", fg="#c9d1d9",
                                  font=("Arial", 10), relief=tk.FLAT,
                                  insertbackground="white", wrap=tk.WORD)
        bsb = ttk.Scrollbar(right, command=self.body_text.yview)
        self.body_text.configure(yscrollcommand=bsb.set)
        bsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.body_text.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.body_text.insert("1.0",
                               "{name} 様\n\nいつもお世話になっております。\n\nよろしくお願いいたします。")

        # 添付ファイル
        att_row = tk.Frame(right, bg="#1e1e1e")
        att_row.pack(fill=tk.X, padx=4, pady=2)
        tk.Label(att_row, text="添付:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(side=tk.LEFT)
        self.att_var = tk.StringVar(value="(なし)")
        tk.Label(att_row, textvariable=self.att_var, bg="#1e1e1e",
                 fg="#888", font=("Arial", 9)).pack(side=tk.LEFT, padx=4)
        ttk.Button(att_row, text="ファイル選択",
                   command=self._pick_attachment).pack(side=tk.LEFT)
        ttk.Button(att_row, text="クリア",
                   command=lambda: (self.att_var.set("(なし)"),
                                    setattr(self, "_attachment", None))
                   ).pack(side=tk.LEFT, padx=2)

        # 送信ボタン
        btn_row2 = tk.Frame(right, bg="#1e1e1e", pady=4)
        btn_row2.pack(fill=tk.X, padx=4)
        tk.Button(btn_row2, text="📧 一括送信開始", command=self._send_all,
                  bg="#1565c0", fg="white", relief=tk.FLAT,
                  font=("Arial", 12, "bold"), padx=20, pady=6,
                  activebackground="#0d47a1", bd=0).pack(side=tk.LEFT)
        ttk.Button(btn_row2, text="🔧 接続テスト",
                   command=self._test_connection).pack(side=tk.LEFT, padx=8)

        self.progress = ttk.Progressbar(self.root, mode="determinate")
        self.progress.pack(fill=tk.X, padx=8)
        self.status_var = tk.StringVar(value="SMTP設定と宛先を入力してください")
        tk.Label(self.root, textvariable=self.status_var,
                 bg="#252526", fg="#858585", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X, side=tk.BOTTOM)

    # ── 宛先操作 ─────────────────────────────────────────────
    def _add_recipient(self):
        dlg = tk.Toplevel(self.root)
        dlg.title("宛先追加")
        dlg.configure(bg="#252526")
        dlg.grab_set()
        name_var  = tk.StringVar()
        email_var = tk.StringVar()
        for label, var in [("名前:", name_var), ("メール:", email_var)]:
            row = tk.Frame(dlg, bg="#252526")
            row.pack(fill=tk.X, padx=12, pady=4)
            tk.Label(row, text=label, bg="#252526", fg="#ccc",
                     width=8, anchor="w").pack(side=tk.LEFT)
            ttk.Entry(row, textvariable=var, width=26).pack(side=tk.LEFT)
        def _ok():
            n = name_var.get().strip()
            e = email_var.get().strip()
            if not e:
                return
            self._recipients.append({"name": n, "email": e, "status": "未送信"})
            self.rec_tree.insert("", tk.END, values=("─", n, e))
            dlg.destroy()
        ttk.Button(dlg, text="追加", command=_ok).pack(pady=8)

    def _import_csv(self):
        path = filedialog.askopenfilename(
            filetypes=[("CSV", "*.csv"), ("すべて", "*.*")])
        if not path:
            return
        try:
            with open(path, encoding="utf-8-sig", newline="") as f:
                reader = csv.DictReader(f)
                for row in reader:
                    name  = row.get("name", row.get("名前", ""))
                    email = row.get("email", row.get("メール", row.get("mail", "")))
                    if email:
                        self._recipients.append(
                            {"name": name, "email": email, "status": "未送信"})
                        self.rec_tree.insert("", tk.END,
                                              values=("─", name, email))
            self.status_var.set(f"インポート完了: {len(self._recipients)} 件")
        except Exception as e:
            messagebox.showerror("エラー", str(e))

    def _remove_recipient(self):
        for sel in self.rec_tree.selection():
            idx = self.rec_tree.index(sel)
            if idx < len(self._recipients):
                del self._recipients[idx]
            self.rec_tree.delete(sel)

    def _clear_recipients(self):
        self._recipients.clear()
        self.rec_tree.delete(*self.rec_tree.get_children())

    def _pick_attachment(self):
        path = filedialog.askopenfilename()
        if path:
            self._attachment = path
            self.att_var.set(os.path.basename(path))

    # ── SMTP ────────────────────────────────────────────────
    def _get_smtp(self):
        host = self._smtp_vars["smtp_host"].get()
        port = int(self._smtp_vars["smtp_port"].get())
        user = self._smtp_vars["smtp_user"].get()
        pwd  = self._smtp_vars["smtp_pass"].get()
        tls  = self.tls_var.get()
        s = smtplib.SMTP(host, port, timeout=10)
        if tls:
            s.starttls()
        if user and pwd:
            s.login(user, pwd)
        return s

    def _test_connection(self):
        self.status_var.set("接続テスト中...")
        def _do():
            try:
                s = self._get_smtp()
                s.quit()
                self.root.after(0, self.status_var.set, "接続テスト: 成功")
            except Exception as e:
                self.root.after(0, self.status_var.set, f"接続テスト: 失敗 - {e}")
        threading.Thread(target=_do, daemon=True).start()

    def _build_msg(self, recipient):
        from_name  = self._smtp_vars["from_name"].get()
        from_email = self._smtp_vars["smtp_user"].get()
        subject    = self.subject_var.get()
        body_tpl   = self.body_text.get("1.0", tk.END)
        body       = body_tpl.replace("{name}", recipient["name"])

        msg = MIMEMultipart()
        msg["From"]    = f"{from_name} <{from_email}>"
        msg["To"]      = recipient["email"]
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain", "utf-8"))

        if self._attachment:
            with open(self._attachment, "rb") as f:
                part = MIMEBase("application", "octet-stream")
                part.set_payload(f.read())
            encoders.encode_base64(part)
            part.add_header("Content-Disposition",
                             f'attachment; filename="{os.path.basename(self._attachment)}"')
            msg.attach(part)
        return msg

    def _send_all(self):
        if not self._recipients:
            messagebox.showwarning("警告", "宛先を追加してください")
            return
        if not messagebox.askyesno("確認",
                                    f"{len(self._recipients)} 件にメールを送信しますか？"):
            return
        self.progress["maximum"] = len(self._recipients)
        self.progress["value"]   = 0
        threading.Thread(target=self._do_send, daemon=True).start()

    def _do_send(self):
        ok = err = 0
        try:
            smtp = self._get_smtp()
        except Exception as e:
            self.root.after(0, self.status_var.set, f"SMTP接続失敗: {e}")
            return

        iids = self.rec_tree.get_children()
        for i, (rec, iid) in enumerate(zip(self._recipients, iids)):
            try:
                msg = self._build_msg(rec)
                smtp.sendmail(self._smtp_vars["smtp_user"].get(),
                               [rec["email"]], msg.as_string())
                rec["status"] = "送信済"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": ("✔", rec["name"], rec["email"]),
                                  "tags": ("sent",)})
                ok += 1
            except Exception as e:
                rec["status"] = f"エラー: {e}"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": (f"✘", rec["name"], rec["email"]),
                                  "tags": ("error",)})
                err += 1
            self.root.after(0, self.progress.configure, {"value": i + 1})

        smtp.quit()
        self.root.after(0, self.status_var.set,
                         f"送信完了: {ok} 件成功 / {err} 件失敗")


if __name__ == "__main__":
    root = tk.Tk()
    app = App093(root)
    root.mainloop()

イベント処理

ボタンのcommand引数でクリックイベントを、bind('')でEnterキーイベントを処理します。どちらの操作でも同じprocess()が呼ばれ、コードの重複を避けられます。

import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import smtplib
import threading
import csv
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime


class App093:
    """メール一括送信ツール"""

    def __init__(self, root):
        self.root = root
        self.root.title("メール一括送信ツール")
        self.root.geometry("960x640")
        self.root.configure(bg="#1e1e1e")
        self._recipients = []    # [{"name": ..., "email": ..., "status": ...}]
        self._attachment = None
        self._build_ui()

    def _build_ui(self):
        header = tk.Frame(self.root, bg="#252526", pady=6)
        header.pack(fill=tk.X)
        tk.Label(header, text="📧 メール一括送信ツール",
                 font=("Noto Sans JP", 12, "bold"),
                 bg="#252526", fg="#4fc3f7").pack(side=tk.LEFT, padx=12)

        tk.Label(self.root,
                 text="⚠ 送信テストは必ずダミーメールサービス (Mailtrap等) で行ってください。",
                 bg="#fff3cd", fg="#856404", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X)

        # メインPaned
        paned = ttk.PanedWindow(self.root, orient=tk.HORIZONTAL)
        paned.pack(fill=tk.BOTH, expand=True, padx=4, pady=4)

        # 左: SMTP + 宛先
        left = tk.Frame(paned, bg="#1e1e1e", width=420)
        paned.add(left, weight=0)

        # SMTP設定
        smtp_f = tk.LabelFrame(left, text="SMTP設定", bg="#252526",
                                fg="#ccc", font=("Arial", 9), padx=6, pady=4)
        smtp_f.pack(fill=tk.X, padx=4, pady=4)

        fields = [
            ("SMTPサーバー",   "smtp_host", "smtp.gmail.com"),
            ("ポート",         "smtp_port", "587"),
            ("ユーザー名",     "smtp_user", "your@email.com"),
            ("パスワード",     "smtp_pass", ""),
            ("差出人名",       "from_name", "送信者名"),
        ]
        self._smtp_vars = {}
        for i, (label, key, default) in enumerate(fields):
            tk.Label(smtp_f, text=f"{label}:", bg="#252526", fg="#ccc",
                     font=("Arial", 9), width=12, anchor="e").grid(
                row=i, column=0, sticky="e", pady=1)
            v = tk.StringVar(value=default)
            self._smtp_vars[key] = v
            show = "*" if key == "smtp_pass" else ""
            ttk.Entry(smtp_f, textvariable=v, width=22,
                      show=show).grid(row=i, column=1, padx=4, pady=1, sticky="w")

        self.tls_var = tk.BooleanVar(value=True)
        tk.Checkbutton(smtp_f, text="TLS/STARTTLS を使用",
                       variable=self.tls_var,
                       bg="#252526", fg="#ccc", selectcolor="#3c3c3c",
                       activebackground="#252526").grid(
            row=len(fields), column=0, columnspan=2, sticky="w")

        # 宛先リスト
        tk.Label(left, text="宛先一覧", bg="#1e1e1e", fg="#888",
                 font=("Arial", 9)).pack(anchor="w", padx=4, pady=(8, 0))
        btn_row = tk.Frame(left, bg="#1e1e1e")
        btn_row.pack(fill=tk.X, padx=4)
        ttk.Button(btn_row, text="＋ 追加",
                   command=self._add_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="📂 CSVインポート",
                   command=self._import_csv).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="🗑 削除",
                   command=self._remove_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="全クリア",
                   command=self._clear_recipients).pack(side=tk.LEFT, padx=2)

        cols = ("status", "name", "email")
        self.rec_tree = ttk.Treeview(left, columns=cols, show="headings", height=10)
        self.rec_tree.heading("status", text="状態")
        self.rec_tree.heading("name",   text="名前")
        self.rec_tree.heading("email",  text="メールアドレス")
        self.rec_tree.column("status", width=60,  anchor="center")
        self.rec_tree.column("name",   width=100, anchor="w")
        self.rec_tree.column("email",  width=200, anchor="w")
        rsb = ttk.Scrollbar(left, command=self.rec_tree.yview)
        self.rec_tree.configure(yscrollcommand=rsb.set)
        rsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.rec_tree.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.rec_tree.tag_configure("sent",  foreground="#26a69a")
        self.rec_tree.tag_configure("error", foreground="#ef5350")

        # 右: メール本文
        right = tk.Frame(paned, bg="#1e1e1e")
        paned.add(right, weight=1)

        tk.Label(right, text="件名:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(anchor="w", padx=4)
        self.subject_var = tk.StringVar(value="お知らせ")
        ttk.Entry(right, textvariable=self.subject_var).pack(
            fill=tk.X, padx=4, pady=2)

        tk.Label(right, text="本文 ({name} で宛先名を差し込み):",
                 bg="#1e1e1e", fg="#ccc", font=("Arial", 9)).pack(
            anchor="w", padx=4)
        self.body_text = tk.Text(right, bg="#0d1117", fg="#c9d1d9",
                                  font=("Arial", 10), relief=tk.FLAT,
                                  insertbackground="white", wrap=tk.WORD)
        bsb = ttk.Scrollbar(right, command=self.body_text.yview)
        self.body_text.configure(yscrollcommand=bsb.set)
        bsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.body_text.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.body_text.insert("1.0",
                               "{name} 様\n\nいつもお世話になっております。\n\nよろしくお願いいたします。")

        # 添付ファイル
        att_row = tk.Frame(right, bg="#1e1e1e")
        att_row.pack(fill=tk.X, padx=4, pady=2)
        tk.Label(att_row, text="添付:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(side=tk.LEFT)
        self.att_var = tk.StringVar(value="(なし)")
        tk.Label(att_row, textvariable=self.att_var, bg="#1e1e1e",
                 fg="#888", font=("Arial", 9)).pack(side=tk.LEFT, padx=4)
        ttk.Button(att_row, text="ファイル選択",
                   command=self._pick_attachment).pack(side=tk.LEFT)
        ttk.Button(att_row, text="クリア",
                   command=lambda: (self.att_var.set("(なし)"),
                                    setattr(self, "_attachment", None))
                   ).pack(side=tk.LEFT, padx=2)

        # 送信ボタン
        btn_row2 = tk.Frame(right, bg="#1e1e1e", pady=4)
        btn_row2.pack(fill=tk.X, padx=4)
        tk.Button(btn_row2, text="📧 一括送信開始", command=self._send_all,
                  bg="#1565c0", fg="white", relief=tk.FLAT,
                  font=("Arial", 12, "bold"), padx=20, pady=6,
                  activebackground="#0d47a1", bd=0).pack(side=tk.LEFT)
        ttk.Button(btn_row2, text="🔧 接続テスト",
                   command=self._test_connection).pack(side=tk.LEFT, padx=8)

        self.progress = ttk.Progressbar(self.root, mode="determinate")
        self.progress.pack(fill=tk.X, padx=8)
        self.status_var = tk.StringVar(value="SMTP設定と宛先を入力してください")
        tk.Label(self.root, textvariable=self.status_var,
                 bg="#252526", fg="#858585", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X, side=tk.BOTTOM)

    # ── 宛先操作 ─────────────────────────────────────────────
    def _add_recipient(self):
        dlg = tk.Toplevel(self.root)
        dlg.title("宛先追加")
        dlg.configure(bg="#252526")
        dlg.grab_set()
        name_var  = tk.StringVar()
        email_var = tk.StringVar()
        for label, var in [("名前:", name_var), ("メール:", email_var)]:
            row = tk.Frame(dlg, bg="#252526")
            row.pack(fill=tk.X, padx=12, pady=4)
            tk.Label(row, text=label, bg="#252526", fg="#ccc",
                     width=8, anchor="w").pack(side=tk.LEFT)
            ttk.Entry(row, textvariable=var, width=26).pack(side=tk.LEFT)
        def _ok():
            n = name_var.get().strip()
            e = email_var.get().strip()
            if not e:
                return
            self._recipients.append({"name": n, "email": e, "status": "未送信"})
            self.rec_tree.insert("", tk.END, values=("─", n, e))
            dlg.destroy()
        ttk.Button(dlg, text="追加", command=_ok).pack(pady=8)

    def _import_csv(self):
        path = filedialog.askopenfilename(
            filetypes=[("CSV", "*.csv"), ("すべて", "*.*")])
        if not path:
            return
        try:
            with open(path, encoding="utf-8-sig", newline="") as f:
                reader = csv.DictReader(f)
                for row in reader:
                    name  = row.get("name", row.get("名前", ""))
                    email = row.get("email", row.get("メール", row.get("mail", "")))
                    if email:
                        self._recipients.append(
                            {"name": name, "email": email, "status": "未送信"})
                        self.rec_tree.insert("", tk.END,
                                              values=("─", name, email))
            self.status_var.set(f"インポート完了: {len(self._recipients)} 件")
        except Exception as e:
            messagebox.showerror("エラー", str(e))

    def _remove_recipient(self):
        for sel in self.rec_tree.selection():
            idx = self.rec_tree.index(sel)
            if idx < len(self._recipients):
                del self._recipients[idx]
            self.rec_tree.delete(sel)

    def _clear_recipients(self):
        self._recipients.clear()
        self.rec_tree.delete(*self.rec_tree.get_children())

    def _pick_attachment(self):
        path = filedialog.askopenfilename()
        if path:
            self._attachment = path
            self.att_var.set(os.path.basename(path))

    # ── SMTP ────────────────────────────────────────────────
    def _get_smtp(self):
        host = self._smtp_vars["smtp_host"].get()
        port = int(self._smtp_vars["smtp_port"].get())
        user = self._smtp_vars["smtp_user"].get()
        pwd  = self._smtp_vars["smtp_pass"].get()
        tls  = self.tls_var.get()
        s = smtplib.SMTP(host, port, timeout=10)
        if tls:
            s.starttls()
        if user and pwd:
            s.login(user, pwd)
        return s

    def _test_connection(self):
        self.status_var.set("接続テスト中...")
        def _do():
            try:
                s = self._get_smtp()
                s.quit()
                self.root.after(0, self.status_var.set, "接続テスト: 成功")
            except Exception as e:
                self.root.after(0, self.status_var.set, f"接続テスト: 失敗 - {e}")
        threading.Thread(target=_do, daemon=True).start()

    def _build_msg(self, recipient):
        from_name  = self._smtp_vars["from_name"].get()
        from_email = self._smtp_vars["smtp_user"].get()
        subject    = self.subject_var.get()
        body_tpl   = self.body_text.get("1.0", tk.END)
        body       = body_tpl.replace("{name}", recipient["name"])

        msg = MIMEMultipart()
        msg["From"]    = f"{from_name} <{from_email}>"
        msg["To"]      = recipient["email"]
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain", "utf-8"))

        if self._attachment:
            with open(self._attachment, "rb") as f:
                part = MIMEBase("application", "octet-stream")
                part.set_payload(f.read())
            encoders.encode_base64(part)
            part.add_header("Content-Disposition",
                             f'attachment; filename="{os.path.basename(self._attachment)}"')
            msg.attach(part)
        return msg

    def _send_all(self):
        if not self._recipients:
            messagebox.showwarning("警告", "宛先を追加してください")
            return
        if not messagebox.askyesno("確認",
                                    f"{len(self._recipients)} 件にメールを送信しますか？"):
            return
        self.progress["maximum"] = len(self._recipients)
        self.progress["value"]   = 0
        threading.Thread(target=self._do_send, daemon=True).start()

    def _do_send(self):
        ok = err = 0
        try:
            smtp = self._get_smtp()
        except Exception as e:
            self.root.after(0, self.status_var.set, f"SMTP接続失敗: {e}")
            return

        iids = self.rec_tree.get_children()
        for i, (rec, iid) in enumerate(zip(self._recipients, iids)):
            try:
                msg = self._build_msg(rec)
                smtp.sendmail(self._smtp_vars["smtp_user"].get(),
                               [rec["email"]], msg.as_string())
                rec["status"] = "送信済"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": ("✔", rec["name"], rec["email"]),
                                  "tags": ("sent",)})
                ok += 1
            except Exception as e:
                rec["status"] = f"エラー: {e}"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": (f"✘", rec["name"], rec["email"]),
                                  "tags": ("error",)})
                err += 1
            self.root.after(0, self.progress.configure, {"value": i + 1})

        smtp.quit()
        self.root.after(0, self.status_var.set,
                         f"送信完了: {ok} 件成功 / {err} 件失敗")


if __name__ == "__main__":
    root = tk.Tk()
    app = App093(root)
    root.mainloop()

Textウィジェットでの結果表示

tk.Textウィジェットをstate=DISABLED（読み取り専用）で作成し、更新時はNORMALに変更してinsert()で内容を書き込み、再びDISABLEDに戻します。

import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import smtplib
import threading
import csv
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime


class App093:
    """メール一括送信ツール"""

    def __init__(self, root):
        self.root = root
        self.root.title("メール一括送信ツール")
        self.root.geometry("960x640")
        self.root.configure(bg="#1e1e1e")
        self._recipients = []    # [{"name": ..., "email": ..., "status": ...}]
        self._attachment = None
        self._build_ui()

    def _build_ui(self):
        header = tk.Frame(self.root, bg="#252526", pady=6)
        header.pack(fill=tk.X)
        tk.Label(header, text="📧 メール一括送信ツール",
                 font=("Noto Sans JP", 12, "bold"),
                 bg="#252526", fg="#4fc3f7").pack(side=tk.LEFT, padx=12)

        tk.Label(self.root,
                 text="⚠ 送信テストは必ずダミーメールサービス (Mailtrap等) で行ってください。",
                 bg="#fff3cd", fg="#856404", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X)

        # メインPaned
        paned = ttk.PanedWindow(self.root, orient=tk.HORIZONTAL)
        paned.pack(fill=tk.BOTH, expand=True, padx=4, pady=4)

        # 左: SMTP + 宛先
        left = tk.Frame(paned, bg="#1e1e1e", width=420)
        paned.add(left, weight=0)

        # SMTP設定
        smtp_f = tk.LabelFrame(left, text="SMTP設定", bg="#252526",
                                fg="#ccc", font=("Arial", 9), padx=6, pady=4)
        smtp_f.pack(fill=tk.X, padx=4, pady=4)

        fields = [
            ("SMTPサーバー",   "smtp_host", "smtp.gmail.com"),
            ("ポート",         "smtp_port", "587"),
            ("ユーザー名",     "smtp_user", "your@email.com"),
            ("パスワード",     "smtp_pass", ""),
            ("差出人名",       "from_name", "送信者名"),
        ]
        self._smtp_vars = {}
        for i, (label, key, default) in enumerate(fields):
            tk.Label(smtp_f, text=f"{label}:", bg="#252526", fg="#ccc",
                     font=("Arial", 9), width=12, anchor="e").grid(
                row=i, column=0, sticky="e", pady=1)
            v = tk.StringVar(value=default)
            self._smtp_vars[key] = v
            show = "*" if key == "smtp_pass" else ""
            ttk.Entry(smtp_f, textvariable=v, width=22,
                      show=show).grid(row=i, column=1, padx=4, pady=1, sticky="w")

        self.tls_var = tk.BooleanVar(value=True)
        tk.Checkbutton(smtp_f, text="TLS/STARTTLS を使用",
                       variable=self.tls_var,
                       bg="#252526", fg="#ccc", selectcolor="#3c3c3c",
                       activebackground="#252526").grid(
            row=len(fields), column=0, columnspan=2, sticky="w")

        # 宛先リスト
        tk.Label(left, text="宛先一覧", bg="#1e1e1e", fg="#888",
                 font=("Arial", 9)).pack(anchor="w", padx=4, pady=(8, 0))
        btn_row = tk.Frame(left, bg="#1e1e1e")
        btn_row.pack(fill=tk.X, padx=4)
        ttk.Button(btn_row, text="＋ 追加",
                   command=self._add_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="📂 CSVインポート",
                   command=self._import_csv).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="🗑 削除",
                   command=self._remove_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="全クリア",
                   command=self._clear_recipients).pack(side=tk.LEFT, padx=2)

        cols = ("status", "name", "email")
        self.rec_tree = ttk.Treeview(left, columns=cols, show="headings", height=10)
        self.rec_tree.heading("status", text="状態")
        self.rec_tree.heading("name",   text="名前")
        self.rec_tree.heading("email",  text="メールアドレス")
        self.rec_tree.column("status", width=60,  anchor="center")
        self.rec_tree.column("name",   width=100, anchor="w")
        self.rec_tree.column("email",  width=200, anchor="w")
        rsb = ttk.Scrollbar(left, command=self.rec_tree.yview)
        self.rec_tree.configure(yscrollcommand=rsb.set)
        rsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.rec_tree.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.rec_tree.tag_configure("sent",  foreground="#26a69a")
        self.rec_tree.tag_configure("error", foreground="#ef5350")

        # 右: メール本文
        right = tk.Frame(paned, bg="#1e1e1e")
        paned.add(right, weight=1)

        tk.Label(right, text="件名:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(anchor="w", padx=4)
        self.subject_var = tk.StringVar(value="お知らせ")
        ttk.Entry(right, textvariable=self.subject_var).pack(
            fill=tk.X, padx=4, pady=2)

        tk.Label(right, text="本文 ({name} で宛先名を差し込み):",
                 bg="#1e1e1e", fg="#ccc", font=("Arial", 9)).pack(
            anchor="w", padx=4)
        self.body_text = tk.Text(right, bg="#0d1117", fg="#c9d1d9",
                                  font=("Arial", 10), relief=tk.FLAT,
                                  insertbackground="white", wrap=tk.WORD)
        bsb = ttk.Scrollbar(right, command=self.body_text.yview)
        self.body_text.configure(yscrollcommand=bsb.set)
        bsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.body_text.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.body_text.insert("1.0",
                               "{name} 様\n\nいつもお世話になっております。\n\nよろしくお願いいたします。")

        # 添付ファイル
        att_row = tk.Frame(right, bg="#1e1e1e")
        att_row.pack(fill=tk.X, padx=4, pady=2)
        tk.Label(att_row, text="添付:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(side=tk.LEFT)
        self.att_var = tk.StringVar(value="(なし)")
        tk.Label(att_row, textvariable=self.att_var, bg="#1e1e1e",
                 fg="#888", font=("Arial", 9)).pack(side=tk.LEFT, padx=4)
        ttk.Button(att_row, text="ファイル選択",
                   command=self._pick_attachment).pack(side=tk.LEFT)
        ttk.Button(att_row, text="クリア",
                   command=lambda: (self.att_var.set("(なし)"),
                                    setattr(self, "_attachment", None))
                   ).pack(side=tk.LEFT, padx=2)

        # 送信ボタン
        btn_row2 = tk.Frame(right, bg="#1e1e1e", pady=4)
        btn_row2.pack(fill=tk.X, padx=4)
        tk.Button(btn_row2, text="📧 一括送信開始", command=self._send_all,
                  bg="#1565c0", fg="white", relief=tk.FLAT,
                  font=("Arial", 12, "bold"), padx=20, pady=6,
                  activebackground="#0d47a1", bd=0).pack(side=tk.LEFT)
        ttk.Button(btn_row2, text="🔧 接続テスト",
                   command=self._test_connection).pack(side=tk.LEFT, padx=8)

        self.progress = ttk.Progressbar(self.root, mode="determinate")
        self.progress.pack(fill=tk.X, padx=8)
        self.status_var = tk.StringVar(value="SMTP設定と宛先を入力してください")
        tk.Label(self.root, textvariable=self.status_var,
                 bg="#252526", fg="#858585", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X, side=tk.BOTTOM)

    # ── 宛先操作 ─────────────────────────────────────────────
    def _add_recipient(self):
        dlg = tk.Toplevel(self.root)
        dlg.title("宛先追加")
        dlg.configure(bg="#252526")
        dlg.grab_set()
        name_var  = tk.StringVar()
        email_var = tk.StringVar()
        for label, var in [("名前:", name_var), ("メール:", email_var)]:
            row = tk.Frame(dlg, bg="#252526")
            row.pack(fill=tk.X, padx=12, pady=4)
            tk.Label(row, text=label, bg="#252526", fg="#ccc",
                     width=8, anchor="w").pack(side=tk.LEFT)
            ttk.Entry(row, textvariable=var, width=26).pack(side=tk.LEFT)
        def _ok():
            n = name_var.get().strip()
            e = email_var.get().strip()
            if not e:
                return
            self._recipients.append({"name": n, "email": e, "status": "未送信"})
            self.rec_tree.insert("", tk.END, values=("─", n, e))
            dlg.destroy()
        ttk.Button(dlg, text="追加", command=_ok).pack(pady=8)

    def _import_csv(self):
        path = filedialog.askopenfilename(
            filetypes=[("CSV", "*.csv"), ("すべて", "*.*")])
        if not path:
            return
        try:
            with open(path, encoding="utf-8-sig", newline="") as f:
                reader = csv.DictReader(f)
                for row in reader:
                    name  = row.get("name", row.get("名前", ""))
                    email = row.get("email", row.get("メール", row.get("mail", "")))
                    if email:
                        self._recipients.append(
                            {"name": name, "email": email, "status": "未送信"})
                        self.rec_tree.insert("", tk.END,
                                              values=("─", name, email))
            self.status_var.set(f"インポート完了: {len(self._recipients)} 件")
        except Exception as e:
            messagebox.showerror("エラー", str(e))

    def _remove_recipient(self):
        for sel in self.rec_tree.selection():
            idx = self.rec_tree.index(sel)
            if idx < len(self._recipients):
                del self._recipients[idx]
            self.rec_tree.delete(sel)

    def _clear_recipients(self):
        self._recipients.clear()
        self.rec_tree.delete(*self.rec_tree.get_children())

    def _pick_attachment(self):
        path = filedialog.askopenfilename()
        if path:
            self._attachment = path
            self.att_var.set(os.path.basename(path))

    # ── SMTP ────────────────────────────────────────────────
    def _get_smtp(self):
        host = self._smtp_vars["smtp_host"].get()
        port = int(self._smtp_vars["smtp_port"].get())
        user = self._smtp_vars["smtp_user"].get()
        pwd  = self._smtp_vars["smtp_pass"].get()
        tls  = self.tls_var.get()
        s = smtplib.SMTP(host, port, timeout=10)
        if tls:
            s.starttls()
        if user and pwd:
            s.login(user, pwd)
        return s

    def _test_connection(self):
        self.status_var.set("接続テスト中...")
        def _do():
            try:
                s = self._get_smtp()
                s.quit()
                self.root.after(0, self.status_var.set, "接続テスト: 成功")
            except Exception as e:
                self.root.after(0, self.status_var.set, f"接続テスト: 失敗 - {e}")
        threading.Thread(target=_do, daemon=True).start()

    def _build_msg(self, recipient):
        from_name  = self._smtp_vars["from_name"].get()
        from_email = self._smtp_vars["smtp_user"].get()
        subject    = self.subject_var.get()
        body_tpl   = self.body_text.get("1.0", tk.END)
        body       = body_tpl.replace("{name}", recipient["name"])

        msg = MIMEMultipart()
        msg["From"]    = f"{from_name} <{from_email}>"
        msg["To"]      = recipient["email"]
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain", "utf-8"))

        if self._attachment:
            with open(self._attachment, "rb") as f:
                part = MIMEBase("application", "octet-stream")
                part.set_payload(f.read())
            encoders.encode_base64(part)
            part.add_header("Content-Disposition",
                             f'attachment; filename="{os.path.basename(self._attachment)}"')
            msg.attach(part)
        return msg

    def _send_all(self):
        if not self._recipients:
            messagebox.showwarning("警告", "宛先を追加してください")
            return
        if not messagebox.askyesno("確認",
                                    f"{len(self._recipients)} 件にメールを送信しますか？"):
            return
        self.progress["maximum"] = len(self._recipients)
        self.progress["value"]   = 0
        threading.Thread(target=self._do_send, daemon=True).start()

    def _do_send(self):
        ok = err = 0
        try:
            smtp = self._get_smtp()
        except Exception as e:
            self.root.after(0, self.status_var.set, f"SMTP接続失敗: {e}")
            return

        iids = self.rec_tree.get_children()
        for i, (rec, iid) in enumerate(zip(self._recipients, iids)):
            try:
                msg = self._build_msg(rec)
                smtp.sendmail(self._smtp_vars["smtp_user"].get(),
                               [rec["email"]], msg.as_string())
                rec["status"] = "送信済"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": ("✔", rec["name"], rec["email"]),
                                  "tags": ("sent",)})
                ok += 1
            except Exception as e:
                rec["status"] = f"エラー: {e}"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": (f"✘", rec["name"], rec["email"]),
                                  "tags": ("error",)})
                err += 1
            self.root.after(0, self.progress.configure, {"value": i + 1})

        smtp.quit()
        self.root.after(0, self.status_var.set,
                         f"送信完了: {ok} 件成功 / {err} 件失敗")


if __name__ == "__main__":
    root = tk.Tk()
    app = App093(root)
    root.mainloop()

例外処理とエラーハンドリング

try-exceptでValueErrorとExceptionを捕捉し、messagebox.showerror()でエラーメッセージを表示します。予期しないエラーも処理することで、アプリの堅牢性が向上します。

import tkinter as tk
from tkinter import ttk, messagebox, filedialog
import smtplib
import threading
import csv
import os
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email import encoders
from datetime import datetime


class App093:
    """メール一括送信ツール"""

    def __init__(self, root):
        self.root = root
        self.root.title("メール一括送信ツール")
        self.root.geometry("960x640")
        self.root.configure(bg="#1e1e1e")
        self._recipients = []    # [{"name": ..., "email": ..., "status": ...}]
        self._attachment = None
        self._build_ui()

    def _build_ui(self):
        header = tk.Frame(self.root, bg="#252526", pady=6)
        header.pack(fill=tk.X)
        tk.Label(header, text="📧 メール一括送信ツール",
                 font=("Noto Sans JP", 12, "bold"),
                 bg="#252526", fg="#4fc3f7").pack(side=tk.LEFT, padx=12)

        tk.Label(self.root,
                 text="⚠ 送信テストは必ずダミーメールサービス (Mailtrap等) で行ってください。",
                 bg="#fff3cd", fg="#856404", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X)

        # メインPaned
        paned = ttk.PanedWindow(self.root, orient=tk.HORIZONTAL)
        paned.pack(fill=tk.BOTH, expand=True, padx=4, pady=4)

        # 左: SMTP + 宛先
        left = tk.Frame(paned, bg="#1e1e1e", width=420)
        paned.add(left, weight=0)

        # SMTP設定
        smtp_f = tk.LabelFrame(left, text="SMTP設定", bg="#252526",
                                fg="#ccc", font=("Arial", 9), padx=6, pady=4)
        smtp_f.pack(fill=tk.X, padx=4, pady=4)

        fields = [
            ("SMTPサーバー",   "smtp_host", "smtp.gmail.com"),
            ("ポート",         "smtp_port", "587"),
            ("ユーザー名",     "smtp_user", "your@email.com"),
            ("パスワード",     "smtp_pass", ""),
            ("差出人名",       "from_name", "送信者名"),
        ]
        self._smtp_vars = {}
        for i, (label, key, default) in enumerate(fields):
            tk.Label(smtp_f, text=f"{label}:", bg="#252526", fg="#ccc",
                     font=("Arial", 9), width=12, anchor="e").grid(
                row=i, column=0, sticky="e", pady=1)
            v = tk.StringVar(value=default)
            self._smtp_vars[key] = v
            show = "*" if key == "smtp_pass" else ""
            ttk.Entry(smtp_f, textvariable=v, width=22,
                      show=show).grid(row=i, column=1, padx=4, pady=1, sticky="w")

        self.tls_var = tk.BooleanVar(value=True)
        tk.Checkbutton(smtp_f, text="TLS/STARTTLS を使用",
                       variable=self.tls_var,
                       bg="#252526", fg="#ccc", selectcolor="#3c3c3c",
                       activebackground="#252526").grid(
            row=len(fields), column=0, columnspan=2, sticky="w")

        # 宛先リスト
        tk.Label(left, text="宛先一覧", bg="#1e1e1e", fg="#888",
                 font=("Arial", 9)).pack(anchor="w", padx=4, pady=(8, 0))
        btn_row = tk.Frame(left, bg="#1e1e1e")
        btn_row.pack(fill=tk.X, padx=4)
        ttk.Button(btn_row, text="＋ 追加",
                   command=self._add_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="📂 CSVインポート",
                   command=self._import_csv).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="🗑 削除",
                   command=self._remove_recipient).pack(side=tk.LEFT, padx=2)
        ttk.Button(btn_row, text="全クリア",
                   command=self._clear_recipients).pack(side=tk.LEFT, padx=2)

        cols = ("status", "name", "email")
        self.rec_tree = ttk.Treeview(left, columns=cols, show="headings", height=10)
        self.rec_tree.heading("status", text="状態")
        self.rec_tree.heading("name",   text="名前")
        self.rec_tree.heading("email",  text="メールアドレス")
        self.rec_tree.column("status", width=60,  anchor="center")
        self.rec_tree.column("name",   width=100, anchor="w")
        self.rec_tree.column("email",  width=200, anchor="w")
        rsb = ttk.Scrollbar(left, command=self.rec_tree.yview)
        self.rec_tree.configure(yscrollcommand=rsb.set)
        rsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.rec_tree.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.rec_tree.tag_configure("sent",  foreground="#26a69a")
        self.rec_tree.tag_configure("error", foreground="#ef5350")

        # 右: メール本文
        right = tk.Frame(paned, bg="#1e1e1e")
        paned.add(right, weight=1)

        tk.Label(right, text="件名:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(anchor="w", padx=4)
        self.subject_var = tk.StringVar(value="お知らせ")
        ttk.Entry(right, textvariable=self.subject_var).pack(
            fill=tk.X, padx=4, pady=2)

        tk.Label(right, text="本文 ({name} で宛先名を差し込み):",
                 bg="#1e1e1e", fg="#ccc", font=("Arial", 9)).pack(
            anchor="w", padx=4)
        self.body_text = tk.Text(right, bg="#0d1117", fg="#c9d1d9",
                                  font=("Arial", 10), relief=tk.FLAT,
                                  insertbackground="white", wrap=tk.WORD)
        bsb = ttk.Scrollbar(right, command=self.body_text.yview)
        self.body_text.configure(yscrollcommand=bsb.set)
        bsb.pack(side=tk.RIGHT, fill=tk.Y)
        self.body_text.pack(fill=tk.BOTH, expand=True, padx=(4, 0))
        self.body_text.insert("1.0",
                               "{name} 様\n\nいつもお世話になっております。\n\nよろしくお願いいたします。")

        # 添付ファイル
        att_row = tk.Frame(right, bg="#1e1e1e")
        att_row.pack(fill=tk.X, padx=4, pady=2)
        tk.Label(att_row, text="添付:", bg="#1e1e1e", fg="#ccc",
                 font=("Arial", 9)).pack(side=tk.LEFT)
        self.att_var = tk.StringVar(value="(なし)")
        tk.Label(att_row, textvariable=self.att_var, bg="#1e1e1e",
                 fg="#888", font=("Arial", 9)).pack(side=tk.LEFT, padx=4)
        ttk.Button(att_row, text="ファイル選択",
                   command=self._pick_attachment).pack(side=tk.LEFT)
        ttk.Button(att_row, text="クリア",
                   command=lambda: (self.att_var.set("(なし)"),
                                    setattr(self, "_attachment", None))
                   ).pack(side=tk.LEFT, padx=2)

        # 送信ボタン
        btn_row2 = tk.Frame(right, bg="#1e1e1e", pady=4)
        btn_row2.pack(fill=tk.X, padx=4)
        tk.Button(btn_row2, text="📧 一括送信開始", command=self._send_all,
                  bg="#1565c0", fg="white", relief=tk.FLAT,
                  font=("Arial", 12, "bold"), padx=20, pady=6,
                  activebackground="#0d47a1", bd=0).pack(side=tk.LEFT)
        ttk.Button(btn_row2, text="🔧 接続テスト",
                   command=self._test_connection).pack(side=tk.LEFT, padx=8)

        self.progress = ttk.Progressbar(self.root, mode="determinate")
        self.progress.pack(fill=tk.X, padx=8)
        self.status_var = tk.StringVar(value="SMTP設定と宛先を入力してください")
        tk.Label(self.root, textvariable=self.status_var,
                 bg="#252526", fg="#858585", font=("Arial", 9),
                 anchor="w", padx=8).pack(fill=tk.X, side=tk.BOTTOM)

    # ── 宛先操作 ─────────────────────────────────────────────
    def _add_recipient(self):
        dlg = tk.Toplevel(self.root)
        dlg.title("宛先追加")
        dlg.configure(bg="#252526")
        dlg.grab_set()
        name_var  = tk.StringVar()
        email_var = tk.StringVar()
        for label, var in [("名前:", name_var), ("メール:", email_var)]:
            row = tk.Frame(dlg, bg="#252526")
            row.pack(fill=tk.X, padx=12, pady=4)
            tk.Label(row, text=label, bg="#252526", fg="#ccc",
                     width=8, anchor="w").pack(side=tk.LEFT)
            ttk.Entry(row, textvariable=var, width=26).pack(side=tk.LEFT)
        def _ok():
            n = name_var.get().strip()
            e = email_var.get().strip()
            if not e:
                return
            self._recipients.append({"name": n, "email": e, "status": "未送信"})
            self.rec_tree.insert("", tk.END, values=("─", n, e))
            dlg.destroy()
        ttk.Button(dlg, text="追加", command=_ok).pack(pady=8)

    def _import_csv(self):
        path = filedialog.askopenfilename(
            filetypes=[("CSV", "*.csv"), ("すべて", "*.*")])
        if not path:
            return
        try:
            with open(path, encoding="utf-8-sig", newline="") as f:
                reader = csv.DictReader(f)
                for row in reader:
                    name  = row.get("name", row.get("名前", ""))
                    email = row.get("email", row.get("メール", row.get("mail", "")))
                    if email:
                        self._recipients.append(
                            {"name": name, "email": email, "status": "未送信"})
                        self.rec_tree.insert("", tk.END,
                                              values=("─", name, email))
            self.status_var.set(f"インポート完了: {len(self._recipients)} 件")
        except Exception as e:
            messagebox.showerror("エラー", str(e))

    def _remove_recipient(self):
        for sel in self.rec_tree.selection():
            idx = self.rec_tree.index(sel)
            if idx < len(self._recipients):
                del self._recipients[idx]
            self.rec_tree.delete(sel)

    def _clear_recipients(self):
        self._recipients.clear()
        self.rec_tree.delete(*self.rec_tree.get_children())

    def _pick_attachment(self):
        path = filedialog.askopenfilename()
        if path:
            self._attachment = path
            self.att_var.set(os.path.basename(path))

    # ── SMTP ────────────────────────────────────────────────
    def _get_smtp(self):
        host = self._smtp_vars["smtp_host"].get()
        port = int(self._smtp_vars["smtp_port"].get())
        user = self._smtp_vars["smtp_user"].get()
        pwd  = self._smtp_vars["smtp_pass"].get()
        tls  = self.tls_var.get()
        s = smtplib.SMTP(host, port, timeout=10)
        if tls:
            s.starttls()
        if user and pwd:
            s.login(user, pwd)
        return s

    def _test_connection(self):
        self.status_var.set("接続テスト中...")
        def _do():
            try:
                s = self._get_smtp()
                s.quit()
                self.root.after(0, self.status_var.set, "接続テスト: 成功")
            except Exception as e:
                self.root.after(0, self.status_var.set, f"接続テスト: 失敗 - {e}")
        threading.Thread(target=_do, daemon=True).start()

    def _build_msg(self, recipient):
        from_name  = self._smtp_vars["from_name"].get()
        from_email = self._smtp_vars["smtp_user"].get()
        subject    = self.subject_var.get()
        body_tpl   = self.body_text.get("1.0", tk.END)
        body       = body_tpl.replace("{name}", recipient["name"])

        msg = MIMEMultipart()
        msg["From"]    = f"{from_name} <{from_email}>"
        msg["To"]      = recipient["email"]
        msg["Subject"] = subject
        msg.attach(MIMEText(body, "plain", "utf-8"))

        if self._attachment:
            with open(self._attachment, "rb") as f:
                part = MIMEBase("application", "octet-stream")
                part.set_payload(f.read())
            encoders.encode_base64(part)
            part.add_header("Content-Disposition",
                             f'attachment; filename="{os.path.basename(self._attachment)}"')
            msg.attach(part)
        return msg

    def _send_all(self):
        if not self._recipients:
            messagebox.showwarning("警告", "宛先を追加してください")
            return
        if not messagebox.askyesno("確認",
                                    f"{len(self._recipients)} 件にメールを送信しますか？"):
            return
        self.progress["maximum"] = len(self._recipients)
        self.progress["value"]   = 0
        threading.Thread(target=self._do_send, daemon=True).start()

    def _do_send(self):
        ok = err = 0
        try:
            smtp = self._get_smtp()
        except Exception as e:
            self.root.after(0, self.status_var.set, f"SMTP接続失敗: {e}")
            return

        iids = self.rec_tree.get_children()
        for i, (rec, iid) in enumerate(zip(self._recipients, iids)):
            try:
                msg = self._build_msg(rec)
                smtp.sendmail(self._smtp_vars["smtp_user"].get(),
                               [rec["email"]], msg.as_string())
                rec["status"] = "送信済"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": ("✔", rec["name"], rec["email"]),
                                  "tags": ("sent",)})
                ok += 1
            except Exception as e:
                rec["status"] = f"エラー: {e}"
                self.root.after(0, self.rec_tree.item, iid,
                                 {"values": (f"✘", rec["name"], rec["email"]),
                                  "tags": ("error",)})
                err += 1
            self.root.after(0, self.progress.configure, {"value": i + 1})

        smtp.quit()
        self.root.after(0, self.status_var.set,
                         f"送信完了: {ok} 件成功 / {err} 件失敗")


if __name__ == "__main__":
    root = tk.Tk()
    app = App093(root)
    root.mainloop()

💡 ダークモードを追加する

bg色・fg色を辞書で管理し、ボタン1つでダークモード・ライトモードを切り替えられるようにしましょう。

💡 データの保存機能

処理結果をCSV・TXTファイルに保存する機能を追加しましょう。filedialog.asksaveasfilename()でファイル保存ダイアログが使えます。

💡 設定ダイアログ

フォントサイズや色などの設定をユーザーが変更できるオプションダイアログを追加しましょう。

❌ 日本語フォントが表示されない

原因：システムに日本語フォントが見つからない場合があります。

解決法：font引数を省略するかシステムに合ったフォントを指定してください。

❌ ライブラリのインポートエラー

原因：必要なライブラリがインストールされていません。

解決法：pip install コマンドで必要なライブラリをインストールしてください。

❌ ウィンドウサイズが合わない

原因：画面解像度や表示スケールによって異なる場合があります。

解決法：root.geometry()で適切なサイズに調整してください。