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Exchange 2007 5.7.1 Errors

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Last Modified: 2012-05-09
Receiving "Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.7.1 Message rejected due to content restrictions (state 18)."

Sporadically when our exchange 2007 receives email. I don't have any special software and have setup no rules in Exchange so I don't know what comes out of the box that I need to turn off. This has just started recently so I don't know if something was turned on due to  a recent windows update.
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