Google now blocks spoofed emails for better phishing protection

https://dubvee.org/post/967579

I.e. it’s now even harder to run your own mail server. If it was crypto-related the argument would be Think.if the children™, since it’s email the excuse is spam.
Having managed an exchange instance for my old job, I can safely say that DKIM and DMARC are just some extra DNS entries for out-of-band verification. They can be boiled down to a pair of checkboxes on a compliance sheet.
I can also say that most of the companies we got emails from didn't have DKIM, and even fewer had DMARC. Or worse, they had DMARC set to p=ignore. Which is honestly even more infuriating.