Folks sending email in quantity are de-facto forced to rent a medallion from a specialized provider of medallions.
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It's a really weird equilibrium, and almost entirely unlike what people naively believe open protocols work like, but it works really well.
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This is basically the business model of LinkedIn InMail.
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what happens if someone's email credentials are compromised? Spam can come from legit domains (e.g. http://Gmail.com )
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See also senderbase from umpteen years ago.
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