According to Microsoft, using the word "spam" to refer to messages like this comes from an iconic Monty Python sketch involving a diner and singing Vikings, of all things.
That means email spam today refers more to emails your subscribers don't actually want to receive. As email marketing guru Chad S. White writes in his book Email Market
If you're getting caught in the spam folder on a regular basis, it may be time to think about how your emails might appear to be spam for your subscribers, even if you're a legitimate business.
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