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I have SharePoint setup to receive mail from exchange 2003 and all works great internally. However when I send a mail from a external source it fails with a 5.7.1 error. I have setup a SMTP connector in exchange for the name space and allowed relays.

Any comments welcome

Thanks

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Can you post the full content of the error message you received ? – Dave Cheney Jun 24 '09 at 3:22
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2 Answers

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Managed to get this working thanks anyway.

Problem was that the contact that sharepoint creates had the tick box for allow authenticated users only ticked in the message restrictions tab.

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Can you please update your question with the answer, so everyone benefits. – Dave Cheney Jun 25 '09 at 4:13
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5.7.1 means Relaying Prohibited, basically the only machine allowed to send mail to recipients of your Exchange 2003 server, is itself.

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