Mavericks, if that matters. On the iPhone, there is a separate subject line before the main message, and on the Mac it shows (as on the phone) in bold at the top of the balloon. But when I want to make a new message on the Mac, I only have the body available.

  • Apple went in the other direction. The subject line has been removed on the iOS Messages! – Andrew Lazarus Jul 10 '16 at 5:09

As far as I can tell, you can't. I have looked everywhere for this feature.

I'd love for this answer to become wrong though.

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