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 emails to remain on-premise with the third party. 

How can we implement such a scenario to ensure emails routing work properly. 
(New to this kind of hybrid setup)

​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 emails to remain on-premise with the third party. How can we implement such a scenario to ensure emails routing work properly. (New to this kind of hybrid setup)    Read More

​