At the company I work and also on the server this blog is hosted we use SpamAssassin to filter our (clients) e-mail messages. In our SpamAssassin configuration we use a few specific DNS based email blacklists. (Commonly called Realtime blacklist, DNSBL or RBL). If the IP address from which the e-mail is send has been blacklisted, some email you send may not be delivered. Email blacklists are a common way of reducing spam.

To check ip adresses against our configered DNSBL's I crafted up a webbased application that reports if a submitted IP is listed or not listed in one of our used DNSBL's. 

 

You can see it in action here: 

http://d-fault.nl/DNSBLLookup

 



Similar sites:

http://dnsbllookup.com/
http://mxtoolbox.com/blacklists.aspx
http://www.dnsbl-check.info/
http://multirbl.valli.org/
 

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