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oceansupport

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550 5.7.1 Unable to relay for <recipient> on Exchange 2003

Recently one of our vendors made a change to their email system and I'm unable to send messages to them.  I get the following error returned by their postmaster.

You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <EMAIL SERVER NAME #5.7.1 smtp;550 5.7.1 Unable to relay for NAME@DOMAINNAME>

I'm on Exchange 2003 running on Windows 2003.

BTW...no problem when I route the message thru our POP account.

Any workaround you can recommend?

Regards
Craig
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scottdorsey
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Do you use authenticated SMTP? Might be worth trying if not.
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Sembee
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oceansupport

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It's just another case of SUS....<   > user syndrome...using a bad email address.

Thanks anyway for your comments.