Gmail now tells you why it decided to junk a particular email message. Looking at my voluminous spam folder, every piece of spam I've received seems to have the reason "Why is this message in Spam? It's similar to messages that were detected by our spam filters." That's not necessarily all that insightful to me personally, but from reading this CNet article, it seems that other reasons are possible.
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A blog about email, anti-spam, policy compliance and email marketing best practices. Published by Al Iverson.