When you attempt to send an email without a subject you get a prompt asking if you want to send it that way. I like that. However, there is one problem, as follows:
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Answer “No” to not send it and return to email so you can enter a subject before sending
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Get distracted by a phone call
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Return to email and forget what you are doing and press the escape key
Results: Email is closed with no prompt to send. It is simply discarded.