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They think I'm relaying?

By pbtoms ·
We recently upgraded to Exchange 2003 on a Win 2003 server. Since that upgrade (from 5.5 on Win2k), I've had this happen several times. Not sure if it's a problem on my end, or other people tightening up, or what. I made sure we're not set up to relay, unless authenticated. That all seems fine. But occasionally we get an email bounced back that implies that we're trying to relay. At least, I THINK that's the implication. Example (names have been changed): on 9/20/2005 12:42 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<MAIL.MyCompany.local #5.5.0 smtp;503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server.>

Is this a problem with my mail server, or theirs? The sender was sending from our office, through our mail server. There were several recipients, and only those from this domain were rejected. Any minute now they're going to land in my office asking why they can't email clients, be good if I had a decent explanation of why it isn't my fault. Or find out why it IS my fault, and fix it before they get here...

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