Google puts its own e-mails into the spam folder :)

Yup.

I follow the Public WebGL specification discussion list, and email from the guys at Google who participate on the list frequently wind up in my spam folder, regardless of how often I mark them as "not spam".

My guess is that a lot of spammers forge To: headers as "whatever@google.com", so the filter learns that such addresses are a good indicator of spam.

newsworthy.