I have just migrated to Exchange 2003 Server to a new hardware, and for some reason my distribution groups are returning this error.
Your message did not reach some or all of the intended recipients.
Subject: ISU vs. Kent State tickets
Sent: 8/9/2007 5:35 PM
The following recipient(s) cannot be reached:
Remote Office on 8/9/2007 5:53 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<FQDN of new server#5.5.0 smtp;550 No such user - psmtp>