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Sender receives NDR 5.1.0

Last Modified: 2012-05-06
We are running Exchange 2007. I have a lone user that has trouble receiving email from another company we do business with. She is able to send email to them, just not receive. She can't receive from anyone sending from that domain. No other users on my Exchange box have any issue sending or receiving from them. Below is the NDR info they receive:

Your message did not reach some or all of the intended recipients.
      Subject:  test email
      Sent:     3/12/2009 5:01 PM
The following recipient(s) could not be reached:
      <My User> on 3/12/2009 5:01 PM
            The e-mail address could not be found.  Perhaps the recipient moved to a different e-mail organization, or there was a mistake in the address.  Check the address and try again.
            <their_domain.org #5.1.0>

I'm trying to determin if this is my issue or theirs. Any help would be greatly appreciated.
The emails they send to me show up in SMTP logs. I don't see a rejection fail or anything else for the instances they try to send to her.
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