> For example, I added "+donation" when I gave money to a political organization once, and now when I see emails from other groups to that address, I know how t

> For example, I added "+donation" when I gave money to a political organization once, and now when I see emails from other groups to that address, I know how they got it. This hasn't worked for literal years. Every spammer on the planet knows to remove plus-addressing from Gmail addresses. The only way to truly know how someone got your email is to use completely separate emails as in Firefox Relay.