I have setup a new user in ad with an email address of test@FP.co.uk
All our other users have addresses of *@w.com
I have changed the mx records, and added the new fp.co.uk recipient policy into exchange etc etc.
I can exchange email internally fine with this user
I can send external email into the firstname.lastname@example.org address ok, and it arrives. However, when i try to reply to send externally i get the following:-
There was a SMTP communciation problem with the recipoents email server. Please contact your system administrator.
(myserver #5.5.0 smtp;554 <email@example.com): Sender address rejected: Access denied>
Is there something I need to do so that I can get this working please?