I have an exchange server using contoso.com (lets say) I have another section of the company that uses Gsuite. That section of the company wants to use contoso.com as their domain name but obviously everything runs through my exchange server and I have the added complexity that I will soon be moving to a hybrid O365 setup.
Is there any supported solution for this? sure I can add SPF for mail out from gmail and mail routing via exchange for mail in but its dodgy setup. Any ideas? thanks.