I got it! Ok, cool, so first, the upgrade to Discourse v3.x + my out of date Mailgun plugin got in the way.
Anyway, the HOW:
- Set up a Mailgun Receiving Route for the address or RegEx pattern for receiving incoming email
- Visit Google Admin
- On the left navigation, expand “Apps”, then “Google Workspace”, and click “Gmail” (this link might work?(
- Click Default routing
- Create a route that maps the address or pattern on your main domain to your Mailgun-powered subdomain: