When creating a new Exchange server for your company it is imperative that you remove ALL test users from the new server before putting it into production. Otherwise, you may end up with the following email:
Your message did not reach some or all of the intended recipients.
Subject: RE: Service Outage
Sent: 10/11/2005 10:59 AM
The following recipient(s) could not be reached:
Jablomy, Heywood on 10/11/2005 10:59 AM
The message was undeliverable because the recipient specified has changed address permanently and forwarding was not applicable.