Not useful, because the human already can see that it is Emacs Lisp
code. And if by "readable" you mean "it's not so ugly and intrusive
that makes the whole message unparsable", well, yeah, not *that* ugly
and intrusive. It's still pretty ugly and makes reading the message
harder.
Yes, it has 2 problems:
1- it's ugly.
2- it does make the code harder to read.
Separators like "---------------------" work much better in this
respect, because they don't contain words and so they're much more
easily abstracted away by your "eyes".
Stefan