I've had countless false positives from Google's spam filter - everything from train tickets to cinema tickets to invitations to parties have been swallowed by

I've had countless false positives from Google's spam filter - everything from train tickets to cinema tickets to invitations to parties have been swallowed by it. About 1 out of 15/20 emails that get flagged are legit. Most are newsletters I signed up to and don't particularly care about, but they're still not spam.