While i also would like a world where i could host my own email server, you have to realize that the "nasty" labeling google is doing is the only reasonable way for a free service.
My prof told me about the university receiving about a terrabyte spam mail a day. Imagine what gmail gets with 90% of mail traffic being spam.
I understand your point of view but still would prefer google to blacklist instead of whitelisting. As a single user, I don't honestly care but this is making it more difficult for companies which find it more difficult to have their own mail servers. Imagine that all their emails end up on their customers gmail spam folder by default, without any proof of being spam. This makes companies to loose business/money.
