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Disable Mailing for O365 domain
Hello there. I have trouble with o365 in connection with our existing mail system, and for whatever reason the ms support is not able to help me. I thought maybe here someone can help me. ...
If you have a cloud mailbox created for the user, messages will be delivered there by default. Is there any particular reason why you have created mailboxes in O365 if your mail system is on-premises?
Can you validate which mail flow scenario you currently see via message headers?
Are you saying the current mail flow looks like this:
Internet>MX>O365 Mailbox?
Or this:
Internet>MX>On Premises>O365 Mailbox?
Do you want O365 mailboxes to receive mail at all?
Do you want mail to be processed by on premises servers prior to being sent to O365?
Is the on premises server new?