Forum Discussion
SMTP Client Authentication on Exchange 2016? (SMTP Relay)
Hello all, Is it possible to setup SMTP Relay on Exchange 2016 to allow authentication from applications outside of our network? For example, let's say we have an ERP software that's install...
ThomasStensitzki-MVP - is a SMTP Client Auth possible w/AD-only user? There should be no mailbox on the Exchange.
As seen: https://serverfault.com/questions/804230/ad-user-authentication-to-exchange-2016
Read you!
hRy
Hello hbilke,
That is a good question. I haven't tried this approach.
Exchange Online requires a valid sender address from your tenant. The allowed sender for the used email address is either the mailbox user itself or a user that has send-as permission for the sender address.
Exchange Online allows only for EXO licensed users as send-as or send-on-behalf users. Therefore, I assume that the answer to your question is no.
-Thomas