We are setting up a new exchange server. I set up the user accounts and they seem to work fine but I created 2 new accounts email@example.com and customer firstname.lastname@example.org.
When I send email to those addresses I get this error.
There was a SMTP communication problem with the recipient's email server. Please verify the e-mail address to which you sent the message is correct. Otherwise, contact your system administrator.
Response from destination mail server:
550 Requested action was not taken because this server doesn't handle mail for that user