Outlook for iOS/Android connects through Microsoft's sync service, which sends each EAS command without credentials first and only retries with Basic auth after a 401 + WWW-Authenticate challenge. SOGo answers these unauthenticated POSTs (Provision, FolderSync, Sync, ...) with 403, so the Outlook apps never get past Provision and show an empty mailbox (#5846). Answer requests without an Authorization header with a Basic challenge in nginx before they reach SOGo. Clients that send credentials up front are not affected.
mailcow: dockerized - 🐮 + 🐋 = 💕
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Info, documentation and support
Please see the official documentation for installation and support instructions. 🐄
🐛 If you found a critical security issue, please mail us to info at servercow.de.
Cowmunity
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Misc
Important: mailcow makes use of various open-source software. Please assure you agree with their license before using mailcow. Any part of mailcow itself is released under GNU General Public License, Version 3.
mailcow is a registered word mark of The Infrastructure Company GmbH, Parkstr. 42, 47877 Willich, Germany.
The project is managed and maintained by The Infrastructure Company GmbH.
Originated from @andryyy (André)
