Or you got hacked by a spammer.
> even if you also happen to send legitimate emails.
And also a bad thing. E.g. for the user losing a critical legit email.
> if Gmail marked all their emails as spam until they stopped, that would be a major quality of life improvement for everyone.
Sorry absolutely not for everyone. To me, receiving legit PayPal email is far more important than being protected from PayPal spam, prevented from employing my own protection.
One size does not fit all.