To route unknown g suite users to another email server for multiple reasons. One being cost saving of a mailbox. This diagram is a common workflow. 







1. Navigate to https://admin.google.com/ and login

2. Navigate to https://admin.google.com/u/1/ac/apps/gmail/hosts 

3. Click "ADD ROUTE"

Screenshot of: Click "ADD ROUTE"

4. Click this field.

Screenshot of: Click this field.

5. Type "mx1.mailhop.org - unknown users"

6. Click this field.

Screenshot of: Click this field.

7. Type "mx1.mailhop.org"

8. Click here.

Screenshot of: Click here.

9. Click this field.

Screenshot of: Click this field.

10. Type "25"

11. Click "Test TLS connection"

Screenshot of: Click "Test TLS connection"

12. Click "SAVE"

Screenshot of: Click "SAVE"

13. Navigate to https://admin.google.com/u/1/ac/apps/gmail/routing


14. Click "ADD ANOTHER RULE"

Screenshot of: Click "ADD ANOTHER RULE"

15. Click this field.

Screenshot of: Click this field.

16. Type "Route unknown users"

17. Click inbound.

Screenshot of: Click inbound.

18. Click internal - receiving.

Screenshot of: Click internal - receiving.

19. Click Change Route

Screenshot of: Click Change Route

20. Down Arrow on normal routing

Screenshot of: Down Arrow on normal routing

21. Click "Unknown Users - DuoCircle"

Screenshot of: Click "Unknown Users - DuoCircle"

22. Suppress Bounces

Screenshot of: Suppress Bounces

23. Click "SAVE"

Screenshot of: Click "SAVE"

This completes the split delivery setup for your domain name. 

Going forward if any email is sent, the email will be first routed to your Gsuite. If the account exists under Gsuite the mail will be delivered successfully.

In case the email account does not exist, the mail will be routed to your Business/ Enterprise Email server and the message will be delivered to the intended recipient.