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SMTP Connection Failure

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SMTP Connection Failure

i_sureshbabu
Hello
We are running Exchange 2003 with service pack2.
Recently we are not getting emails from particular companies.
Even Yahoo. This is the error message from yahoo:
reason: 550 5.7.1 Requested action not taken: message refused) ----- Transcript of session follows ----- ... while talking to natform.com.: >>> DATA <<< 550 5.7.1 Requested action not taken: message refused 554 5.0.0 Service unavailable .
Let me know if you need more info.