Our Office 365 mail flow are pointing to on premise. The mail flow is: from internet -> MX record -> Postini -> Relay -> Hub1/Hub2 (Exchange 2010) -> Exchange Hybrid 2013 -> Send/Recieve Connector -> Office 365.
I want o change the mail flow pointing to Office 365. I think I need to change the MX record pointing to Office 365. I am not sure how to configure the mail flow properly. What about hub servers (2010)? Do on premise users still receive emails after I change the MX record pointing to Office 365?
Please give me some advices or any document for it.