alt Hacker NewsCan we use DMARC to ask Gmail to close registrations? Google Calendar to allow far fewer people the ability to send invite notifications? Firebase to close registrations? Azure? Microsoft 365? AWS SES?
It feels like the biggest spammers have swung back to just abusing SaaS and getting SPF / DKIM / DMARC for free from one of the big email providers.
Exactly this. Spammers have the technical competence to overcome any technical hurdle, so using evidence of technical competence achieves nothing.
If it were possible to charge $0.25/email for delivery, I'd be more than happy . However, I'm sure large tech firms will need to say that is "too hard to implement at scale".