Force Dovecot not to log connect/disconnect messages

Question

My /var/log/mail.log gets constantly flooded with Dovecot connect/disconnect messages like this:

Mar 29 18:15:48 summit dovecot: IMAP(foo@bar.baz): Disconnected: Logged out bytes=63/2126          
Mar 29 18:15:50 summit dovecot: imap-login: Login: user=<baz@bar.foo>, method=PLAIN, rip=4.3.2.1, lip=1.2.3.4, TLS

These are repeated ad infinitum (to the tune of 11MB of logs per day), and they're obscuring the more important authentication failures and Postfix deliveries/receptions. I've checked Dovecot's wiki page for logging, but no option there stops these messages. Is there any configuration variable I can set within dovecot.conf to stop these messages being sent to mail.log?

Clarification: I still want Dovecot to log to mail.log; I just don't want it logging these frivolous connect/disconnect messages.

Answer 1

Enable Logging to a file with log_path and/or info_log_path then comment out syslog_facility.

or

Change the syslog_facility and control the output with /etc/syslog.conf.

:/etc/dovecot.conf

##
## Logging
##

# Log file to use for error messages, instead of sending them to syslog.
# /dev/stderr can be used to log into stderr.
#log_path = /var/log/dovecot.log

# Log file to use for informational and debug messages.
# Default is the same as log_path.
#info_log_path = /var/log/dovecot-info.log

...

# Syslog facility to use if you're logging to syslog. Usually if you don't
# want to use "mail", you'll use local0..local7. Also other standard
# facilities are supported.
syslog_facility = mail