Email routing setting
If you have the legacy free edition of G Suite, upgrade to G Suite Basic to get this feature.
The Email routing setting is deprecated and will soon be removed from usage, replaced by the Routing
setting. During this transitional period, Email routing settings are still visible in the Admin Console, labeled with a red "deprecated" tag. The settings still work for domain-level and catch-all address routing, but you can't edit them or create new ones.
If you used the Email routing setting to configure domain-level routing and catch-all address routing, you need to convert the configurations.
For routing guidelines and best practices, see Email routing and delivery.