Still trying to build my black list (hostkarma) and looking for more
spam. The way it works is that any of you can add this as your highest
numbered MX record.
http://wiki.junkemailfilter.com/index.php/Project_tarbaby
It returns a 421 error after the DATA command. Anything that comes to us
doesn't go to you. We harvest spam bot data and it goes to your
blacklist that prevents those spam bots from being effective.
And - if you use our black lists then it is already tuned to your spam
bots. Here's info on the lists and how to make SpamAssassin work with it.
http://wiki.junkemailfilter.com/index.php/Spam_DNS_Lists