Every now and then friends ask why they can't send email. The usual answer these days is that your IP is on a spam list. I've been using the DNS Stuff tool, Blacklist Mastering System™. This morning I used SpamCop's blacklist tool (for some reason, I forget why) to find that a friend's IP was blacklisted. Generally the solution is to contact your ISP to let them know that they've been listed as a spammer and to get them removed from the blacklist. I usually use whatsmyip.com to find out what my IP is at any given moment.
Spam Blacklist Lookup Sites
January 26th, 2006
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Comments
This one also mxtoolbox looks useful - I'm not getting anything at all from DNSStuff at the moment. Hopefully that's temporary.