Hi,
this is not a genuine Dovecot bug, more a nuisance. It applies to OpenSuse 13.2 but maybe also to other Linux's.
The standard installation of Dovecot (especially 10-ssl.conf) places the certificate dovecot.pem in /etc/ssl/certs. Sometimes during updates does OpenSuse renew all certificates in /etc/ssl/certs and erases dovecot.pem. This blocks further access to the mailbox.
I found a similar report here: https://bbs.archlinux.de/viewtopic.php?id=27288
Workaround: Move dovecot.pem to another directory and change 10-ssl.conf accordingly.
Regards
Wolfgang Gross
-- Dr. W. Gross Sektion Chirurgische Forschung Klinik für Allgemein-, Viszeral- und Transplantationschirurgie Universitätsklinikum Heidelberg Im Neuenheimer Feld 365, D-69120 Heidelberg, Germany Tel. ++49 (0)6221/566392, Fax: ++49 (0)6221/566402 WGross@uni-hd.de