S?ren Peter Skou <sps@DanskKabelTV.dk> writes:

I've experienced that IMAP/IMAPS stops responding. To restore service there is only one way, restart Dovecot completely. This leads to services being interrupted for some people, so it seems to only affect some of the users on the server. But POP3/POP3s is still running happily. Also, it happens more as we approach Rush Hour.

Help us help you: the problem is most likely pointed out in the log files. Also, a dump of your configurations (doveconf -n) would help.

Offhand, it seems you've hit an IMAP resource limit, such as mail_max_userip_connections, or perhaps process/memory limits (e.g. process_limit, vsz_limit, etc.).

Joseph Tam <jtam.home@gmail.com>