I sign in using Sign in with Apple. My account used to use an Apple Hide My Email relay address when logging in to Pokémon GO using my Apple account. That relay address has since been deleted from iCloud and can no longer receive mail.
As a result, I am no longer using the Hide My Email relay address and instead using my iCloud address, which is no longer hidden from Pokémon Go as my login method. Since then, I have no longer been receiving any Wayfarer-related emails.