I’ve setup a new mailcow instance last weekend (Ubuntu 22.04, custom Apache reverse proxy and certificates via ISPConfig), and it all went reasonably well.
I’ve only got two mailboxes, which I migrated off an old Plesk installation. I used Thunderbird to copy all emails from the old inboxes to a local folder, and copied those back into the new mailcow inboxes later on.
Whats confusing me is that I can see all emails without any problem in SoGo and via IMAP, while Outlook for Android connected via ActiveSync only shows the emails that were received after switchting the servers, but none of the “imported” ones.
Does anyone know what could cause this, and how to fix it?