Quick question about mail routing in O365.
Once we have migrated all mailboxes to cloud this is how we would like mailflow.
External email comes in to cloud mailbox,user responds and mail is sent out. O365 routes outbound mail to On-Prem mailbox Server, mail server attaches signature (Exclaimer Mail util is sitting on both MBX servers on prem) mail server routes back to o365 then out to the internet from there.
I have asked MS this same question and get 17 diff answers. can anyone shed some light.