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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?
Hi David,
There could be several solutions depending on your requirements.
Microsoft has a article on mail flow best practices, maybe this can guide you to a solutions.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/mail-flow-best-practices
At first I would say it is the MX record in DNS. Did you add <MX token>.mail.protection.outlook.com with a higher priority than your company.de MX record?
Regards