How check if your server is on a Blacklist server

Listed below are some good sites to check if your server is listed on any of the major black lists around the globe.

Then go to these sites to check if you are listed, if you are you will have to remove yourself after checking that you have not got a virus or other software sending out spam, and that you do not have any open relays to allow spamers to use your server to forward spam to the rest of the world.

MxToolbox: www.mxtoolbox.com

Spamhaus: www.spamhaus.org

Please help to make the world a spam free'er place.