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For my custom domain I set up a catch-all so *@sharparam.com gets routed to my main address. If I end up needing to reply from such an address I set up a proper alias for it (currently I use GSuite to manage it).

Another alternative if you don’t have your own domain is to put a plus in the email address. The mail server will ignore anything after that plus, eg johnsmith+facebooklogin@gmail.com will have all email sent to johnsmith@gmail.com, but it will preserve the To header in the email.

This is useful for detecting the origin of spam, however it’s trivial for a spammer or hacker to workaround (just strip the plus and anything after it before sending)

> It's been done a bunch a times I understand.

Got any links to these services?

And, sadly, the more users use it the more chance that the big players start to ban such addresses.

It actually happened with the anti-spam services I‘ve used, twice.