I got this error when trying to send email to one email adress on a single domain.

Reporting-MTA: dns; mail.outletcity.no
X-Postfix-Queue-ID: 676CFCBB3A
X-Postfix-Sender: rfc822; ****@powermedia.no
Arrival-Date: Thu, 5 Jun 2008 13:35:45 +0200 (CEST)

Final-Recipient: rfc822; ****@gothiagroup.com
Original-Recipient: rfc822;*****@gothiagroup.com
Action: failed
Status: 5.0.0
Remote-MTA: dns; vfgw.gothiagroup.com
Diagnostic-Code: smtp; 554 No SMTP service here

Anyone got any idea why?