On Sun, 13 Sep 2015 00:25:42 +0530 Ram <r...@netcore.co.in> wrote: > I am seeing a surge in the number of password attempts both at my > postfix smtp servers as well as imap servers > These attacks seem to be targetted since the attempts are made at > correct userids
I am using sshguard. It doesn't support Postfix yet but in case you use Dovecot's authentication mechanism it should work. There is also a patch available for it to work with Postfix. Another option is fail2ban (I have no experience with it though). Have a look here: http://www.sshguard.net/ http://unix.stackexchange.com/questions/44483/protecting-postfix-from-bruteforce-attacks http://www.djs.to/2013/10/1-postfix-sasl-support-for-sshguard/ -- Niklaas
