Question on using routing to filter emails but keep destination email address

Can you explain what kind of use-case you have for this?

This is exactly how email routing / email forwarding services work.

They receive them, and (try to) pass them on to another mailbox.

That won’t be possible on the exact same (sub-)domain, -

However, you can make “mail.example.com” handle the traffic for a sub-domain instead, such as e.g. how I mentioned in the following posts:

Or, the more elaborative post over here:

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