Exchange Active Sync disabled, Outlook still using it?

kofl007

Hi,

in the default configuration mailcow disables ActiveSync for Outlook Desktop, which is fine.

‘useEASforOutlook’ => ‘no’,

But my Outlook (2016, 365) still configures the mailcow server via Exchange ActiveSync?

Thanks for clarification

esackbauer

Have you done “docker compose up -d” after changing that setting?

kofl007

It was already the default setting. Couldn’t believe it, as the documentation doesn’t reflect it. But also on git it’s disabled by default.

esackbauer

Yes, indeed. Strange. The question is how Mailcow recognizes Outlook. User agent? Maybe MS changed something and Mailcow doesnt recognize it.

kofl007

Yes, strange. Maybe with Outlook 365, but it’s also with Outlook 2016 - out of mainstream support, only gets security updates.

kofl007

Interesting, it depends on the Outlook version:

Outlook 365 configures as IMAP (via Control Panel -> Mail, direct setup assistant does not work, which is known)
Outlook 2016 configures as Exchange Active Sync (via control panel and setup assistant directly from Outlook)

kofl007

Solved: the Outlook 2016 client was on the internal LAN, same LAN as mailcow and split DNS name resolution was not setup correctly.
The real-life Outlook autoconfiguration test (Strg + Righ-Click on Outlook Icon in status bar -> Test Email Autoconfiguration) showed it nicely.