When sending a preview, it would be great to put "DRAFT" at the beginning of the subject line so that it is clear that it is a draft, and so that sorting by subject will bring up all drafts together. Sometimes we have been confused thinking that a draft was actually the email being sent out and not taking action correctly. The text in red that is inserted at the top of the email does not draw attention enough to signal that it is a draft. And most of the time, I do not put any text in that area, so it looks even more like the actual email. I have to scroll down all the way to the bottom to see the disclaimer.
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