You installed Courier or Dovecot and you put SquirrelMail on your box for webmail.
Then you were good enough to set up fail2ban or (my favorite) CSF/LFD. But you tested a brute force attack on Squirrelmail’s login page, and you noticed that LFD doesn’t detect brute force login attempts. Why not? Continue reading Prevent Squirrelmail Brute Force Attacks