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I recently found my mail server on a SpamList, due to a rather large volume of email that was pumped out by one of our internal departments. I've submitted requests at Spamhaus.org to be unblocked, and their automated web based process does a pretty good job of removing you quickly. http://cbl.abuseat.org/lookup.cgi?ip=your.mailserver.ip.here http://www.spamhaus.org/query/bl?ip=your.mailserver.ip.here However, when I check my mail server logs, I find a few hosts responding by saying: 550 Service unavailable; Client host [mail.law.msu.edu] blocked using ip.blacklist.zap; Mail From IP Banned Here's the problem I'm having: ip.blacklist.zap isn't a valid internet hostname, so of course my browser returns a host not foud error if I try to look it up on the web. Google searches don't produce anything useful on the ip.blacklist.zap name, so I don't know who to contact to get my server taken off their spammer list. If any of you have encountered this before, please let me know. Thank you. John A. Resotko Head of Systems Administration Michigan State University College of Law 208 Law College Building East Lansing, MI 48824-1300 email: [log in to unmask] Phone: 517-432-6836 Fax: 517-432-6861 Current Chairperson of the MSU Network Communications Committee