Question : #5.5.0 smtp;553 We do not relay non-local mail, sorry.

Sending an email from our domain to another specific domain we get this error message:


Your message did not reach some or all of the intended recipients.
The following recipient(s) cannot be reached:
      'Joe Bloggs' on 27/07/2010 9:04 a.m.
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <mailserver.ourdomain.com #5.5.0 smtp;553 We do not relay non-local mail, sorry.>

Our Environment:
Server 2003
Exchange 2003
Emailing anyone else is fine.

Any suggestions?

Answer : #5.5.0 smtp;553 We do not relay non-local mail, sorry.

Try doing a BIOS firmware update maybe.