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You can specify Markdown variant in Content-Type. Source: https://tools.ietf.org/html/rfc7763 https://tools.ietf.org/html/rfc7763 https://www.iana.org/assign

• tbe 9y ago
  Ok, good to know, thanks. The point still stands that the receiver's client probably doesn't bother styling the message. I mean even if GMail, say, was persuaded to do it, Outlook for instance wouldn't.