iredmail-doc/turn.on.debug.mode.in.dovecot.md

http://www.iredmail.org/wiki/index.php?title=IRedMail/FAQ/Turn.On.Debug.Mode.In.Dovecot #Turn on debug mode in Dovecot In /etc/dovecot.conf or /etc/dovecot/dovecot.conf, change mail_debug to yes, then restart dovecot service.

mail_debug = yes

If you need authentication and password related debug message, turn on related settings and restart dovecot service.

auth_verbose = yes
auth_debug = yes
auth_debug_passwords = yes
auth_verbose_passwords = yes