Forum Discussion
Setting up Hybrid Email setup with MS Exchange online and Third Party On-Prem (Non Microsoft)
I have a client with a third party mail server hosted on-premise. They are planning to have a hybrid setup where a part of the emails are to be hosted on Exchange Online and the remainder of the emai...
The native Microsoft hybrid setup only works with Exchange servers.
You need to set up connectors in EXO to accept mail from the on-premises mail infrastructure and send mail to the on-premises mailboxes. You'll need to configure similar routing on the on-prem messaging infrastructure you are using.
The more difficult thing will be figuring out how the on-prem infrastructure identifies mailboxes that exist in EXO and routes mail for them to EXO (and the reverse in EXO). A native hybrid uses a combination of target addresses, mail enabled users and connectors to handle this. There might be some documentation the vendor has on how to achieve this.
You need to set up connectors in EXO to accept mail from the on-premises mail infrastructure and send mail to the on-premises mailboxes. You'll need to configure similar routing on the on-prem messaging infrastructure you are using.
The more difficult thing will be figuring out how the on-prem infrastructure identifies mailboxes that exist in EXO and routes mail for them to EXO (and the reverse in EXO). A native hybrid uses a combination of target addresses, mail enabled users and connectors to handle this. There might be some documentation the vendor has on how to achieve this.