Hack Attack

Someone mentioned they got a bounce from my domain’s email. I went to take a look at the error and discovered a couple of hosts trying to brute force login to my SMTP server. Some quick config changes to create a blacklist, and a fail2ban install and it has stopped now.

Lesson 1: check your logs often
Lesson 2: use SASL
Lesson 3: use complex and random passwords
Lesson 4: install and configure fail2ban or blacklist the bozos with iptables or hosts.deny or something.

I got most of these right the first try, especially the middle two.

Eternal vigilance, they say…


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