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SPEWS1

What you see when your domain has this problem
Added to SPEWS1 Details area Ignore

More Information About Spews1

SPEWS is a list of areas on the Internet which several system administrators deny E-mail from. Warning: Intentionally lists legitimate mailservers that either have IPs close to spammers, or that had problems in the past that have been completely fixed. Should not be used to block mail, although could be used in a weighting system.

More information about SPEWS1 can be found at their website: http://www.spews.org/

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