Autodiscover/Autoconfig: add CNAME records pointing autodiscover.example.com and autoconfig.example.com at MAILCOW_HOSTNAME. Mailcow ships XML responses for both Apple, Thunderbird, and Outlook clients — users only type their email and password.
App passwords: when 2FA is on (TOTP), users need a per-device app password for IMAP/SMTP clients. Generate in SOGo → Preferences → Mail or via Mailcow UI → Mailbox details. Store the app password in the device keychain — it can't be recovered.
iOS quirks:
- iOS Mail will sometimes pick POP over IMAP from autodiscover — force IMAP manually if you see it.
- "Mail Days to Sync" defaults to No Limit and will pull GBs on first sync. Set to 1 month for fresh devices.
Android quirks:
- Gmail app does not honor autoconfig. Users must add via "Other (IMAP)" manually.
- K-9 Mail / FairEmail work flawlessly.
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