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We have since turned off POP3 access, but I am a little surprised that we are seeing these types of attacks on our new Kerio server. I thought the software was supposed to prevent this.

Here's what's in the security log:

[28/Apr/2007 06:05:08] Failed POP3 login from, user info<_a.t_>
[28/Apr/2007 06:05:08] Failed POP3 login from, user service<_a.t_>
[28/Apr/2007 06:05:08] Failed POP3 login from, user online<_a.t_>

This goes on an on. We used to get hit all the time by attacks like this on our old mail server, and it would slow to a crawl while it was happening.

How can I set up Kerio so that we don't get a dictionary attack like this, other than limiting the IP range access in Services? A brute force POP attack like this should be blocked by the mail server software automatically (somehow).

I have read the thread at =e55bfa0a6a92b5e5557cffda05583958&srch=dictionary#msg_42 821


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