環境

• PRETTY_NAME=”Ubuntu 22.04.3 LTS”
• Python 3.10.12
• pip 22.0.2 from /usr/lib/python3/dist-packages/pip (python 3.10)

手順

imap_toolsというのが楽らしいのでインストール

pip install imap_tools

インポートして実行

import imap_tools
mailbox_name = "INBOX.ジム.予約"
status, messages = mail.select(imap_tools.imap_utf7.encode(mailbox_name))

何もしない場合のエラー

mail.select(“INBOX.ジム.予約”)

として

yoshitake@mail:~/dovecot_delivery$ python3 test.py 
Traceback (most recent call last):
  File "/home/yoshitake/dovecot_delivery/test.py", line 15, in <module>
    mail.select("INBOX.ジム.予約")
  File "/usr/lib/python3.10/imaplib.py", line 756, in select
    typ, dat = self._simple_command(name, mailbox)
  File "/usr/lib/python3.10/imaplib.py", line 1230, in _simple_command
    return self._command_complete(name, self._command(name, *args))
  File "/usr/lib/python3.10/imaplib.py", line 987, in _command
    arg = bytes(arg, self._encoding)
UnicodeEncodeError: 'ascii' codec can't encode characters in position 6-7: ordinal not in range(128)

ソース全体

import imaplib
import imap_tools
from email.header import decode_header

# IMAPサーバの設定
mail_server = 'mail.huga.co.jp'
username = 'hoge'
password = 'hugahuga'

# IMAPサーバに接続
mail = imaplib.IMAP4_SSL(mail_server)
mail.login(username, password)

# # メールボックスを選択
mailbox_name = "INBOX.ジム.予約"
status, messages = mail.select(imap_tools.imap_utf7.encode(mailbox_name))

# # メール検索（例: 未読メール）
status, messages = mail.search(None, "(UNSEEN)")
unread_count = len(messages[0].split())
print(f"未読メールの件数: {unread_count}")

# 接続を閉じる
mail.close()
mail.logout()