2 Mar
2015
2 Mar
'15
1:34 a.m.
The other side of this equation, Postfix, has had this capability for years. Why it hasn't been added to dovecot is a mystery. It's the only thing (really, the ONLY thing!) that I dislike about dovecot.
http://wiki2.dovecot.org/PasswordDatabase/ExtraFields/AllowNets
then setup fail2ban to manage extrafields