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for a brief period I had to correspond with a lawyer whose mail program generated them; I discovered that you could simply double click them in Apple Mail and they would open.

Given that APple preferes to rewrite rather than bug-fix/upgrade I have no idea if that's still true; haven't seen one in many years.

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If you drag a message out from Apple Mail, say to the desktop, it will save that message as a .eml file. And if you inspect it, it's simply the raw message itself — as it would be in, say, a Maildir folder. You can literally 'cat' the file. Unless there are multiple versions of '.eml' that have different formats...

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