I do like the simplemail philosophy of making messages trivial to type
and easy to read in the absence of a simplemail interpreter.
But I do have one nit-pick (so far): the "literal lines" markup of
COLON SINGLE-QUOTE-SPACE is sort of at odds with the stated goal that
"It must be simple to include a block of literal text such as a file
or program fragment." Okay, it's _simple_ ...it's just not _easy_.
So I guess I'm wishing for something in simplemail that might've been
cool to've had in richtext: some sort of a <verbatim> construct that
encloses literal text without requiring special markup constructs
anywhere in the enclosed text (except perhaps for a piece of enclosed
text that might be taken as the closing delimiter).
Here's one way that the example from section 3.5.1 might be done
for (i=0; i <=10; i++)
a[i] = i