Am 10.06.2015 um 00:19 schrieb Scott Lambert:
I've been looking for, but haven't found, yet, a postfix option that would delay x seconds after a failed auth attempt. We still use fail2ban, but the botnets are just too large.
This can be set within Dovecot when using Dovecot for SASL authentication. /etc/dovecot/conf.d/10-auth.conf auth_failure_delay = 5 secs -- Alex JOST