Hi,
[Olaf Hopp] - [2016-08-02 23:45]
just a shot into the dark: if you are running out of entropy, you might get SSL errors. If this is a virtual machine, there are not many entropy sources. Consider installing alternative entropy sources like haveged(*), available in many distro repos.
Thank you for your hint. I followed the entropy idea when I first encountered this strange behaviour, but there was no shortage.
Tweaking the parameters for the imap_login service seemed to fix the problems, now I need to try to set them to reasonable values in order to have the best compromise between "secure" and "high performance" as described in the Dovecot wiki.
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