[Normille]

  >..a way to do that is by having a personal domain, and have all mail sent to whatever email addresses at that domain you want this to happen for forwarded to your personal domain.

Been there. Done that. It doesn't work.

Having a catch-all email address like this just generates mountains of spam. There are spammers out there who will just carpet bomb domains with likely sounding email addresses in the hope one turns out to exist; [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail]... etc. etc.

With a catch-all email on your domain, you'll end up getting all this spam -multiple times over!

[Someone]

I wrote “email addresses […] you want this to happen for”. That list can be as open or restricted as you want it to be.

[Normille]

Aye. But then, every time you want to create a new address, you have to go into your email admin/preferences/whatever and add that new email address as another alias. It soon ends up being a lot of work, so the tendency is [or was when I foolishly tried it] to just tick the "catch-all" box –with spam avalanche results.

[Someone]

That could be automated, and would make things as easy as what the OP described (could be as easy as “when I enter a new “from” address, add it to the list”)

[Normille]

Automation would definitely make the process less painful. I'm struggling to see how it could be done though, unless you're running your own mailserver.

I use Google email servers[0] [or 'Gsuite' as it's now called] to handle email for some of my domains and Yandex email for domains [1] [or 'Connect' as it's now called] for others. In order to create a new email account, or add a new alias, it involves logging in and clicking through a few screens of admin section. I'm not saying it couldn't be automated but I don't think it would be easy.

If anyone has done something like this, please share some tips!

[0] https://gsuite.google.com/ [1] https://connect.yandex.com/