Errors:
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Sep 4 18:25:19 mx dovecot: auth: Fatal: No passdbs specified in configuration file. LOGIN mechanism needs one
Sep 4 18:25:19 mx dovecot: master: Error: service(auth): command startup failed, throttling for 2 secs
Sep 4 18:25:19 mx dovecot: submission-login: Disconnected: Auth process broken (disconnected before auth was ready, waited 0
secs): user=<>, rip=134.255.226.247, lip=134.255.226.248
Sep 4 18:25:21 mx dovecot: auth: Fatal: No passdbs specified in configuration file. LOGIN mechanism needs one
Sep 4 18:25:21 mx dovecot: master: Error: service(auth): command startup failed, throttling for 4 secs
Sep 4 18:25:21 mx dovecot: imap-login: Disconnected: Auth process broken (disconnected before auth was ready, waited 1 secs)
: user=<>, rip=134.255.226.247, lip=134.255.226.248
Sep 4 18:25:24 mx dovecot: managesieve-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip
=134.255.226.247, lip=134.255.226.248
Sep 4 18:25:25 mx dovecot: auth: Fatal: No passdbs specified in configuration file. LOGIN mechanism needs one
Sep 4 18:25:25 mx dovecot: master: Error: service(auth): command startup failed, throttling for 8 secs
Sep 4 18:25:25 mx dovecot: pop3-login: Disconnected: Auth process broken (disconnected before auth was ready, waited 3 secs)
: user=<>, rip=134.255.226.247, lip=134.255.226.248
-------------------------------------------------------------------------
So it looks to me something is missing for the "auth" service. Do you have any ideas?