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Configure split delivery

Note: The email settings described on this page are legacy routing controls. In a future release, these legacy settings will be migrated to the new routing controls that are also available on the Advanced settings page -- for example, Receiving routing and Sending routing. For instructions, see Mail routing and delivery: Guidelines and best practices. During a transition period, both sets of controls will function simultaneously. If any conflict exists between the controls -- for example, if you configure two different outbound gateways -- the newer settings will override the legacy settings described here. While it's possible to use both sets of routing controls, we encourage you to use only the new and improved routing settings described in Guidelines and best practices.

With split delivery, an incoming message is delivered to either a Gmail inbox or a legacy system inbox depending on the recipient. Use split delivery during a phased roll-out of G Suite to deliver mail to the Gmail inbox for pilot users and to the legacy email inbox for users who are not part of the pilot group. Split delivery can also be permanent if only some of your users use Gmail, or to implement special handling for certain types of email, such as messages to the Legal department.

To configure split delivery, you route all email through the G Suite email servers, but pass messages for non-Gmail users on to your legacy email system.

To configure split delivery:

  1. Update your domain MX records to route email to the G Suite email servers.
    For details, see Configuring email delivery.

  2. Sign in to the Google Admin console

  3. From the dashboard, go to Apps > G Suite > Gmail > Advanced settings

  4. In the Organizations section, make sure your domain is highlighted -- for example,

  5. Scroll down the page to find the Email routing section (or you can also type email routing in the Search settings field).

  6. At the bottom of the Email routing section, click Add another destination. (This opens a new dialog box in the Email routing section.)

  7. In the Destination box, enter the name of the domain to which you want to forward mail for non-Gmail users, or the IP address of the mail server.

    If you enter a domain name, G Suite forwards messages to the mail server designated by that domain's MX records. For a legacy mail server that is part of the same domain that uses G Suite, create a domain alias and update the MX records for the alias domain to route email to the legacy mail server; enter the alias domain name in the Destination box.

  8. For the Deliver email for option, select Unknown mailbox accounts only.

    With this option selected, the G Suite mail server will forward all messages that are not addressed to users who have Gmail accounts.

  9. At the bottom of the page, click Save changes.

It can take up to an hour for the changes to propagate through Google systems.

The Email routing settings enable you to configure other advanced routing options as well. See Email routing for details about these options.

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