Your cons are all about the cons of email client supporting HTML. My intended question was, given the existing support for HTML email, is there a reason for a s

Your cons are all about the cons of email client supporting HTML. My intended question was, given the existing support for HTML email, is there a reason for a sender to not take advantage of it? Your reasons 1-3 above don't apply because I won't do those things. But what would be a con is if, because of those dangers, enough recipients reject HTML email out-of-hand.