smtp block brute force attacks

[TheEther]

Originally Posted by tal56

Hi guys,

I'm getting a lot of smtp brute force attacks lately and on my /var/log/secure logs they don't even list the IP of the person trying the attacks. They look like this :

What's the best way to block these attacks? Thanks

Blocking SMTP authentication brute force attacks using Fail2Ban
http://theether.net/kb/100141

Cheers,

Jamie.