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.
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