Ask HN: How does Gmail detect promotional emails?

1 points by sameid ↗ HN
I've always wondered what the magic code was that Gmail used to detect Promotional Emails. Is it some super Regex or something far more complex?

2 comments

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Almost certainly some statistical method - perhaps Bayesian.
Thanks for the reply, I assume that would require a large set of actionable data? I'll definetly start reading up on Bayesian Statistics.