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On Mail, I looked under prefs for encoding choices and couldn't find any.Hi, Rita,
Mail>Menu bar>Message>Text Encoding is what you're looking for...to a degree, anyhow.
I have absolutely no idea how it works, but good luck with it.
Edit: Mine is set at Automatic, and it reverts from Unicode (UTF-8) to Automatic after an e-mail incorporating the Unicode option is sent, if that's of any importance.
I sent e-mails to myself (using the Unicode option) incorporating " ⌥ ⇧ ¢ ⬆ ⬇ ↠↑ ↓ → ©   ⌘ â‹€" and "ð„ž ð„¡ ð„¢ â™® ♯ ð„ª ð„«," and I received them intact.
(The "Automatic" setting seemed to yield the same results, so...
. )
Hope this helps.