#Settings Support OAuth for IMAP import

[gtandersen]

Is your feature request related to a problem? Please describe.
Services are increasingly requiring more secure login methods such as OAuth to export data. OAuth support for import of email via IMAP would satisfy requirements by e.g. Microsoft Office365.

Describe the solution you'd like
OAuth support for IMAP import on the Manager > Retrieve screen (https://runbox.com/mail/fetch) which utilizes Imapsync.

Additional context

• Imapsync Office 365 OAUTH2: Office 365 OAUTH2 imapsync/imapsync#250 (comment)
• OAuth2-ImapSync: https://github.com/JCoupalK/OAuth2-ImapSync
• The great 2025 email yak-shave: O365 + mbsync + mu + neomutt + msmtp: https://benswift.me/blog/2025/09/12/the-great-2025-email-yak-shave-o365-mbsync-mu-neomutt-msmtp
• Zimbra Migration: IMAPSync https://wiki.xmission.com/Zimbra_Migration:_IMAPSync