https://bugs.kde.org/show_bug.cgi?id=350831

--- Comment #3 from Friedemann Schorer <friedemann.schorer@gmx.de> ---
Uhh, my brain hurts...

Forgot to mention: 
my computer now resolves the domain correctly, i.e. nslookup returns the LAN-IP
of my server, all relevant ports do respond. So I doubt it's a server issue.
The server runs an instance of Kolab 3.4, using Courier and Postfix

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