Of more than 300 billion emails sent every day, at least half are spam. Email providers have the huge task of filtering out spam and making sure their users receive the messages that matter. Spam detection is messy. The line between spam and non-spam messages is fuzzy, and the criteria change over time. From various efforts to automate spam detection, machine learning has so far proven to be the most effective and favored approach by email providers. Although we still see spammy emails, a quick look at the junk folder will show how much spam gets weeded out of our inboxes every day thanks to machine learning…
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