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

More Information About Netherrelays

Nether.net Open-Relay Blacklist: Any host that sends e-mail to an invalid username @ puck.nether.net or @nether.net is tested to insure that it is not an open-relay. due to the proliferation of spam due to open-relays we have found this to be a necessity.

More information about NETHERRELAYS can be found at their website: http://puck.nether.net/or/