Exchange 2003: remote sender cannot send messages to domain, can reply to messages sent from domain

So, a random remote email sender is trying to send one of my users an email.  Each time the remote sender's message is bounced back.  The full text of the error message is as follows:

Reporting-MTA: dns; TMPMX1.REMOTEDOMAIN.COM
Arrival-Date: Mon, 30 Oct 2006 15:48:18 -0500 (EST)
Final-Recipient: rfc822; username@domain.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mail.domain.com[XXX.XXX.XX.XX] said: 550 5.7.1 Requested action not taken: message refused

Looks like the remote mail server is Postfix.  The local mailserver, that I manage, is an Exchange 2003 server.

I can send this remote sender a direct message with no problem.  The remote sender can reply to a message from me or others in the domain with no problem.

DNS reports check out for their email server and our Exchange server.  Neither is listed on any RBLs.

Anyone have any ideas?

Your help would be appreciated.
pteeterAsked:
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redseatechnologiesConnect With a Mentor Commented:
Hi pteeter,

I am quite confident this is not going to be your issue, rather a client issue at the other end.

If they are using outlook 2003, they probably have a dodgy name in their contacts, or in the outlook NK2 file (the autocomplete rubbish)

Get them to remove and re-add their contact, or try typing the address manually

Hope that helps,

-red
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pteeterAuthor Commented:
This is exactly what I was hoping and assuming.

I'll verify the client type and version on the remote sender's end.

I love troubleshooting email issues for people that work for other companies.  ; )

Thanks Red.

PJT
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redseatechnologiesCommented:
LOL, good luck with it.

I had a shocker of a problem the other day, turned out they had an entry in their local dns server for our web server (pointing to 10.10.10.10 no less)

Good times :)

-red
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