Set up Split Delivery with Google Workspace first

Problem

How to set up a Split Delivery rule having Google Workspace first, in other words, the domain's MX records will point to Google's mail servers.

Environment

  • Gmail

Solution

  1. Add your non-Gmail server in the Admin console with the Add Route setting:
    1. In your Google Admin console.
    2. Go to Menu > Apps > Google Workspace > Gmail > Hosts.
    3. Click Add Route.
    4. In the Add mail route box, enter a name or description for the new mail route. If this field is empty, you can't save the new setting.
    5. Specify email server:
      1. Click the menu  and select a host option: Single host or Multiple hosts.
      2. Under the host options menu, enter server IP addresses or hostnames:
        1. If you selected Single host, enter the server hostname (recommended) or IP address. Enter the port number: 25, 587, or a number from 1024 to 65535. You can't use port 465 for the single host option.
        2. If you selected Multiple hosts, specify multiple primary and secondary hosts for load balancing and backup. Enter the server hostnames (recommended) or IP addresses in the Primary and Secondary host tables.

          The total load for the servers you add must total 100% in each table. For example, in the Primary host table, if you added two hosts, enter 50 in the Load % field for each server.

    6. Select the options for the new route. Options with Recommended are on by default for new routes:
      1. Perform MX lookup on host—Deliver to the hosts associated with the domain you entered. If you entered a domain, check this box to verify the host MX record and deliver to the servers in the domain MX record. If you entered an email server, leave this box unchecked.
      2. Require mail to be transmitted over a secure transport (TLS) connection (Recommended)—Encrypt messages between sending mail servers and receiving mail servers with Transport Layer Security (TLS).
      3. Require CA signed certificate (Recommended)—The client SMTP server must present a certificate signed by a Certificate Authority that is trusted by Google.
      4. Validate certificate hostname (Recommended)—Verify that the receiving hostname matches the certificate presented by the SMTP server.
    7. To verify the connection to the servers that you added, click Test TLS connection.
    8. At the bottom of the Add mail route box, click Save. Changes can take up to 24 hours but typically happen more quickly.
  2. Set up split delivery.
    1. In your Google Admin console.
    2. Go to Menu > Apps > Google Workspace > Gmail > Routing.
    3. On the Routing tab, scroll to Routing.
    4. Click Configure or Add Another Rule. The Add setting box opens.
      1.  In the Add setting box, Enter a name or description for the new rule. You can't save the new rule if this field is empty.
      2. Under Email messages to affect check the Inbound box, the Internal-receiving box, or both.
        1. Inbound—Incoming messages from external senders are delivered to both the primary and secondary server.
        2. Internal-receiving—Incoming messages from internal senders are delivered to both the primary and secondary server. Messages from internal senders have your organization's domain or subdomain in the From field.
      3. For above type of messages.
        1. Click the menu and select Modify message.
        2. Click the Change route box.
        3. Under Change route, click the menu and select the external server where you'll deliver the affected messages.
        4. Scroll down, and click Show options.
      4. Options.
        1. Under Account types to affect, check the Unrecognized/Catch-all box. The Users and Groups boxes should be unchecked.
        2. (Optional) To apply this setting only to senders or recipients that you specify:
          • Under Envelope filter, check one or both boxes.
          • Click the menu and select an option for matching sender and recipient addresses.
          • Enter an email address, pattern, or group to match.
          • Repeat for all senders and recipients.
      5. At the bottom of the Add setting box, click Save. Changes can take up to 24 hours but typically happen more quickly