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Mail flow route through on primses spam firewall

Last Modified: 2020-01-22
I have hybrid Office 365  with exchnage 2010 I want to use the filtering and compliance solutions that are already in my on-premises spam firewall.
Mail sent to the internet from cloud mailboxes and onprimses  must route through my on-premises spam firewall. .

please suggest me below step is correct or not.

1. MX record to my on-premises ip addresss
2.Create outgoing connector on office 365 portal  (any email to our public ip address)
3.Create receive connector on primses.
One more question ,later staget if i  decommision exchnage 2010 and keep only onprimses firewall and office 365, how mail flow will happend.
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Network Security Engineer
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