troubleshooting Question

Using Exchange Online for dual delivery Exchange emails boxes and Gmail inboxes

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TechInTheWoodsFlag for United States of America asked on
Microsoft OfficeExchangeMicrosoft 365Gmail
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Currently use Office 365/Exchange Online for email. Domain examples: mydomain.org/mydomain.onmicrosoft.com
Added GSuite to our offerings, but did not enable gmail functionality. Same domain: mydomain.org
Two different mindsets from users: Some want to keep using Exchange Online for email, some want to use Gmail for email. There is no "Definitive Line" where we could logically seperate those users.
Moving away from Exchange Online represents a large number of unwanted changes.
Preliminary research indicates we can use Dual Delivery routing to use an external server to Gmail and Exchange. Does this mean we can just have one Email management system, in this case--Exchange Online--copy emails to gmail, without having to setup seperate, new email addresses on Gmail?

The quote below is taken directly from https://support.google.com/a/answer/2685650

You set up dual delivery to deliver email messages to 2 or more inboxes. For example, users can receive messages in a Gmail inbox and a non-Gmail inbox, such as a Microsoft Exchange inbox or an archiving server.

With this configuration, incoming mail is delivered to a primary mail server, which processes and delivers each message. The primary server then forwards a copy of the message to a secondary mail server, which delivers it to the second inbox. The primary server is the mail server identified in the MX records for your public domain.

If the external server is the primary server, you configure that server to also forward messages to Google. You also configure the Inbound gateway setting in so that Gmail knows that the incoming mail is being rerouted to it from the external server and performs the appropriate SPF checks.


So what I'm seeing is that in order to do this, Exchange Online would be setup to forward messages to Google. Does anyone know what that would translate to on the O365 side? Would that be a connector? A transport rule? An Accepted Domain?
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