I have a customer running windows SBS 2011 standard with a primary domain and a primary authoritative email domain. They are changing the name of the business so I have added an additional authoritative email domain on the SBS server.
If someone sends an email to an employee under the Aldo mean they receive that email and it appears to be automatically forwarded to the new authoritative domain. They can then reply to the email and it will send using the new authoritative domain that I set up, and it appears the original sender received the reply. However when I send an email to the new authoritative mean it is not received by the recipient.
This is a firm that has to be up and running before midnight tonight so it is worth every single penny I can award for resolution immediately.