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Windows 2003 Server - I have people attempting to break into my email server - what is my proper response?

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Last Modified: 2012-05-05
I've checked my email server logs, and I'm getting a lot of attempts to break in via brute-force + dictionary attacks.

I know the IP's that are doing it - is there an easy way for me to A) Block these IPs B) Automatically detect and block new ones in the future without affecting my email clients

Thanks
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Commented:
It's not from the local machine - it's from an external IP address -- possibly in the same server farm but probably outside of it.


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Commented:
They're trying a variety of logins & passwords on a specific domain.

I'll block the IP on my firewall - do you think I should add an IP-Filter on the server itself or should I configure the hardware firewall outside my server?

Thanks for the tips
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Commented:
Ok, I'll configure the hardware firewall.

Do you have any comments on the second part of my question -- Is there some way to either alert me via email when a cracker is trying to get in - or auto-block an IP that tries to access too much?

Thanks

P.S., my email server software does not have this functionality
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