GSuite to Other (as Back up)
Post date: Oct 08, 2018 5:15:18 PM
Suite -> Gmail -> Adv Settings -> General Settings -> Recipient Address Map -> Edit
All Incoming Messages
Also Route to Original (True)
Add X-Gm-Original-To Header (Yes)
Note: Name@Domain.x, Name@Domain.y Then Click Add.
https://support.google.com/a/answer/4524505?hl=en