Forum Discussion
Solved
Office 365 domain using external email server
Hello, Our tenancy has a number of different domains associated with it, all subscribed to O365 Business Professional. For one specific domain (lets call it business2.com), email is still hosted ...
- Hi!
A connector is not ultimately required. What is required is that the domain is set to non-authoritative (Internal Relay) in the Exchange Admin Centre. I used to do this a lot of Coex migrations
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/manage-accepted-domains/manage-accepted-domains
Once set to internal relay which you can change in accepted domains or by PowerShell and assuming the MX is directed at the external mail platform it ought to resolve
However, if this doesn’t work by itself you add an external send connector from Office 365 to the mail server
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail
Hope that helps and answers your question!
Best, Chris
Hi!
A connector is not ultimately required. What is required is that the domain is set to non-authoritative (Internal Relay) in the Exchange Admin Centre. I used to do this a lot of Coex migrations
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/manage-accepted-domains/manage-accepted-domains
Once set to internal relay which you can change in accepted domains or by PowerShell and assuming the MX is directed at the external mail platform it ought to resolve
However, if this doesn’t work by itself you add an external send connector from Office 365 to the mail server
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail
Hope that helps and answers your question!
Best, Chris
A connector is not ultimately required. What is required is that the domain is set to non-authoritative (Internal Relay) in the Exchange Admin Centre. I used to do this a lot of Coex migrations
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/manage-accepted-domains/manage-accepted-domains
Once set to internal relay which you can change in accepted domains or by PowerShell and assuming the MX is directed at the external mail platform it ought to resolve
However, if this doesn’t work by itself you add an external send connector from Office 365 to the mail server
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/use-connectors-to-configure-mail-flow/set-up-connectors-to-route-mail
Hope that helps and answers your question!
Best, Chris
ChrisHoardMVPThanks very much for the information. Worked perfectly, as long as I was patient waiting for the update to take effect.