I just signed up for Firefox Relay. I like being able to create email aliases to cut down on spam/hide my email address. I would like to be able to choose which of my emails the alias forwards to. Say if I have a google, Microsoft, and proton email. I would like to be able to select which email it forwards to vs. being always forced to send the aliases to the same account.
I understand this could be used to spam people, so having some sort of verification that you own the account when adding a new account would be necessary (i.e. send a verification code to the email etc)