Earlier quoted context omitted.
This is overly simplistic. Frequently you get blocked because your IP block legitimately has a lot of people with poor computer hygiene who are a source of large amounts of spam which puts your IP on a reputation blocklist. There are legitimate and valid reasons for Google or Microsoft to be taking the actions that they do because email is an extremely hostile environment. Blaming them for that environment is silly.…
It goes beyond self hosting and IP blocks, because even if you use a large email provider other than Google or Microsoft, Google will quite happily block you too. So far as I can surmise: I got a ban from Google, that lasted a month because I sent a mail to a contact that contained the text of an advert I wished to complain about. During that time I could send mail to my own Google account but to nobody else's. If Go…
This isn't Googles fault. It's baked into how email works when combined with Eternal September. Blaming them is like blaming the Weather Channel for bad weather. They are just the messenger. Google has it's fair share of suspect activities but this isn't one them.