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I am still setting it up, but I've seen Mailrise and Apprise that essentially achieves this.

The nice thing about Apprise is that it can direct notifications to various places, not just another email server.

Looks nice but does it support "oauth2" authentication for the final smtp server that will be used?

It is a need because it is a cancer that propagated to all big mail domain providers like gmail and microsoft 365. They are supposed to be business tools and still it is almost impossible to setup "device" email accounts that would identify just with credentials or equivalent without having to use a "web browser".

I couldn't think of a use case for something this. For anyone else like me, the readme outlines one near the bottom which seems genuinely nice:

Set this up, allow no-auth sending from any address on your LAN, and then spinning up new local services that need outgoing mail is easy, because you can just give them the IP of the relay and omit credentials.

What does this bring compared to apt-get install-ing an established mail server like procmail or exim and configuring it to work as a relay for the local LAN?