[delfinom]

https://support.google.com/mail/contact/abuse

You can use this form

>They should at least be good citizen on the sending side, which it seems they're not. They are killing email.

Eh? They do tons in anti-bot detection. But the value in exploiting and using Google's service is extremely high so bot authors are increasingly getting creative. Google stops running Gmail and simply another service becomes a high value target.

At least Microsoft fixed their Azure abuse after 10 years of not giving a fuck. It used to be stupid fucking easy to setup a trial O365 tenant and spam the fucking internet through "onmicrosoft.com" domains. And they let that go for 10 years.