I have a server that was originally going to be all in one type server, website, mail ftp, etc.
Since, the customer has moved their email to a hosted exchange solutions.
When the site generates form emails, they are getting held up with the following error:
The e-mail system was unable to deliver the message, but did not report a specific reason. Check the address and try again. If it still fails, contact your system administrator.
< te10.workithosting.com #5.0.0 X-Postfix; User unknown in virtual alias table>
I have disabled all of the mail features for this server but it still tries to accept mail for users when the email is generated from localhost.