I have redirected email from a domain that gets nothing but 3,000+ pieces of spam a day to a new Gmail.com account. In the first 5 minutes, Gmail is batting 23 for 25. That is, it correctly identified 23 pieces of spam as spam, and incorrectly identified 2 pieces of spam as ham (not spam). That’s an 8 per cent error rate. We’ll see how it evolves over time.