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What you see when your domain has this problem
Added to RATS NoPtr Details area Ignore

More Information About Rats Noptr

RATS-NoPtr - An IP Address which has no reverse DNS, and probably the home of a SpamBot -- If you are listed in the Spamrats / RATS-NoPtr blacklist and you operate your own mail-server, you have no "Reverse-DNS Entry" in place with your ISP to resolve that IP Address to your server's host-name.

More information about RATS NoPtr can be found at their website: http://www.spamrats.com