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If you use gmail, you can add a + followed by anything and it goes to the same mailbox.

For example, if signing up to drop, I might use myemail+drop@gmail.com

Makes it very easy to see which services are selling the address you provide to advertisers

Yeah I know, and you're unfortunately correct that I use Gmail, but it's something I'm planning to change soon.

Also, if someone was targeting you with spam that won't help. They'll just remove the "+..." and you're back to the same problem.