Looks like UNICODE or UTF8 to me. Try copying from the original e-mail and pasting it into Microsoft Word - Word might auto-detect it for you. If not, try “paste special” and pick different options to see if anything emerges.
It seems you have a literal-minded friend - all Greek it is. Don’t know enough Greek to say what it might be about, though, or if it’s just Greek nonsense.
Hmm… The actual text is greek, but it absolutely makes no sense. It feels like somebody wrote something in english, and then passed through a english-to-greek web translator… It’s exactly like the garbage (sense-wise) these things produce. If I try to retranslate it word for word in english, I can see sense shining through. It wasn’t written in greek originally, though.
I have no time to properly translate it right now, but it seems that the text Larry Mudd supplies comes pretty close.