"You do not have permission..." but with an angle

Hello all.

I have someone who is trying to send to my Exchange 2003 box (@company.com).

When they send a new message, it gets through no problem.
When they send a reply, we get this back:

Your message did not reach some or all of the intended recipients.

      Subject:  RE: Test message from company
      Sent:     6/14/2006 8:53 AM

The following recipient(s) could not be reached:

      user@company.com on 6/14/2006 8:53 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mail.othercompany.com #5.7.1 smtp;550 5.7.1 Unable to relay for user@company.com>

I have dealt with these before, but they were always and 'all the time' thing.  This is different, since new messages get through, but replies don't.

I do not yet have a lot of info on the sending server.

I don't believe the problem is at my end.  There is nothing in my event viewer, or in any of my logs for my virus/security/spam software.

Any ideas?  Is it all at their end?  Any suggestions I can pass on?

Thanks,

TN
tnormanAsked:
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SembeeConnect With a Mentor Commented:
The fact that the sending server is in the NDR, means that the message is being generated at their end.
Therefore all the diagnostics has to take place at the remote end. Number one diagnostic is prove that the server is trying to connect to your server. An SMTP log would do that, with the IP address logged. If it isn't connecting to your server, then the problem is with that end.

Simon.
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tnormanAuthor Commented:
Simon...thanks for that.  It was interesting, due to the 'new/reply' angle.

However, since putting back 'in their lap', I haven't heard anything, so I am going to close it up.

Thanks,

TN
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