> I have user database in ldap (samba). I want to use fail2ban to restrict
> unsuccessful login attempts, but... I cannot see "Authentication
> failure" message in ANY log. (/var/log/mail.log shows successful logins
> as well as disconnects.)
> How should I proceed?

Check your dovecot.log

dovecot: imap-login: Aborted login (auth failed, 2 attempts in 4 secs): 
user=<xxxxxxx>, rip=xxxxxxxx
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