Hello,
We deployed a Exchange Hybrid with O365 and an on-prem Ex2013 Server. We use the option "Centralized mail flow" as configured in the HCW.
Goal is that messages sent from o365 mailbox are routed through the on-prem ex2013 server and then to the external recipient.
When we test this mailflow, we get an error from the Ex2013 server, that the relay is not permitted. error 550 5.7.1
The HCW did not change anything on the Ex2013 receive connector.
I expected that the HCW would make all required modifications needed to allow the Ex2013 to "relay" mails from o365 to external recipients. IS this assumption correct?
Do I need to configure a new receive connector on Exchange to allow this mailflow? If yes, how would the connector be configured?
please any advice on this issue. Thanks