Forum Discussion
Domain impersonation in hybrid
Hi all, I've strange behavior in my Exchange hybrid deployment. I have 2 internal Exchange 2016 mailbox servers and 2 Edge 2016 servers. All mailboxes are still hosted onpremises. Hybrid conf...
We have a similar config except that the mailboxes are on EXO and only the on-prem systems send out through our legacy Exchange. What you are describing should work.
Have you validated your SPF with someone like Dmarcian or looked closely at the headers of a repudiated mail to see what CompAuth et al are saying about you?
Do you publish DMARC and if so, what does it say about DKIM? Is your own DMARC policy repudiating you?
If you have already checked all of that, I fear that a call to Product Support lies in your future.
Have you validated your SPF with someone like Dmarcian or looked closely at the headers of a repudiated mail to see what CompAuth et al are saying about you?
Do you publish DMARC and if so, what does it say about DKIM? Is your own DMARC policy repudiating you?
If you have already checked all of that, I fear that a call to Product Support lies in your future.
