Today I stumbled upon this error in my qmail-send log (yes qmail-send, not dovecot.log)
@400000005e5303ff0fe76364 delivery 407: success: lda(postmaster@mydomain.xy):_Error:_net_connect_unix(/usr/local/dovecot/var/run/dovecot/stats-writer)_failed:_Permission_denied/did_0+0+1/
Fortunately the messages were delivered successfully to the Maildirs despite of this problem.
I realized that I had to setup the stats service when upgrading in the past days. Unfortunately the configuration example shipped by dovecot doesn't even mention how to setup this service, anyway I quickly found the solution on google. It is sufficient to start the service as vpopmail adding these lines to 10-metrics.conf
service stats {
unix_listener stats-reader {
user = vpopmail
group = vchkpw
mode = 0660
}
unix_listener stats-writer {
user = vpopmail
group = vchkpw
mode = 0660
}
}
