If company X leaks your email, close your account with them and block the address.
Also, it's useful for have i been pwned. One of my few accounts which uses a grouped address is in today's data dump, and it wasn't clear what account it was, because of the grouping.
Also, it's useful for have i been pwned. One of my few accounts which uses a grouped address is in today's data dump, and it wasn't clear what account it was, because of the grouping.