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Error Code 553

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Error Code 553 - 4.Feb.2006 8:00:14 PM   


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Joined: 4.Feb.2006
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I am running Exchange 2003 service pack 2 on a windows 2000 server platform.  Mail security for exchange is running in this environment.

Users retrieve their messages via Pop and send via smtp.  exchange is used merely as a holding area for the messages.  however users are now getting this error whenever they try to send a message via outlook "553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)"

Why would this error occur and what can be done to resolve the issue.

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