Email routing config & rules

Hi ,

I ’ m currently trying to have a system for a team which allows them to forward emails to their already existing email boxes through another domain .

Imagine this is domain 1: hi.com
Imagine this is domain 2: bye.com

Everyone already has an email address on D1 (hi.com), for example, John Richard who joined the company in 2022’s email is jrichard2[email protected]hi.com

How would I setup email routing to allow users to just ‘input’ [email protected]bye.com (D2) or [email protected]bye.com (D2) and for that to forward to [email protected]hi.com (D1) ?

There are approx 2000 users .

( Sorry for link . com Discourse settings disallow me to post links )

Any help is appreciated ,
Thanks !