Here's a brief call for help.
Is there anyone out there who uses a recent kmail (I'm running 16.04.1 since yesterday, before that it was the latest KDE4 release) with a Novell Groupwise IMAP server?
I'm trying hard, I really like kmail and would like to keep using it, but for me right now it's extremely unstable (to the point of being unusable) - and I suspect by now that the server IMAP implementation is at least partially to blame. In the past I've seen definitive broken server behaviour (like negative IMAP uids), the feared "Multiple merge candidates" keeps popping up again and again, and the IMAP resource becomes unresponsive every few minutes...
So any datapoints of other kmail plus Groupwise imap users would be very much appreciated.
For reference, the server here is Novell Groupwise 2014 R2, version
14.2.0 11.3.2016, build number 123013.