One "gotcha" though -- a lot of the smarter spammers that real domain names will send their spam from different mailservers than the ones in their MX records. That way, their mail will be less likely to be blocked, and you'll have to actually have a sample of the spam before blocking them -- and they can later change the IP address they are spamming from, and be free to send more mail.Currently FriendGreetings.com resolves to 65.89.168.4 and www.FriendGreetings.com resolves to 65.89.168.4. Mail for FriendGreetings.com is handled by mail.FriendGreetings.com (10) 65.89.168.30. Leske's List can be found at: http://www.famhost.com/support/files.zip
But it certainly can't hurt to block their MX records if they are known spammers. :)
-Scott
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