I Upgraded a server from Ubuntu 16.04 to Ubuntu 18.04. This includes an upgrade
from dovecot 2.2.22 to 2.2.33.2.
Sometimes it happens, that dovecot stops showing new mail. There is no error in
the log, dovecot just seems to do his normal operations but is not delivering
new emails from /var/mail/user (for some users only) emails are delivered again
if I delete index-files from .imap folder.
Ajay Guleria
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