Can't receive mail from a external particular sender

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Hi,

Can anybody help me out with this one, we have an SBS2003 server which has
been working well for years and we haven't made any recent changes.

The problem is we have one customer that receives an NDR when sending mail
to a valid user on our SBS, this is the NDR he gets. The strange thing is the
SBS user receives external mail from everybody else and can even send mail to
the user that is getting the NDR.

Any ideas on what I should be looking for?

The e-mail account does not exist at the organization this message
was sent to. Check the e-mail address, or contact the recipient
directly to find out the correct address.
< c2bthomr10.btconnect.com #5.1.1 SMTP; 550 5.7.1 Unable to relay

.

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