Tuesday, 7 April 2015
Recipient address rejected : Access denied
If your new alias in Office365 gives this error simply follow below steps.
550 5.4.1 [firstname.lastname@example.org]: recipient address rejected: access denied
Please change the DomainType to InternalRelay and see if the problem occurs,
To do so, Login to ECP (outlook.office365.com/ecp) -> Mailflow -> AcceptedDomain -> Select Domain.com -> Change it to “InternalRelay”
Hope this helps.!