http://www.maildr.com/
http://www.unmailable.com/
http://www.unmailed.com/
Check if your IP is listed on a blacklist
http://whatismyipaddress.com/staticpages/index.php/is-my-ip-address-blacklisted
Hey Papa Bear!
http://www.schneier.com/blog/
Notes on creating the yahoo-style directory for reaching spammer products directly.
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