[I am not on this mailing list, but happened to come across the draft.]
I like the idea in general. Two comments:
(1) It is unclear whether the last line of a paragraph has a space at the
end or not. In other words, do I write (using _ to show space):
(2) I think you need to do something about the Usenet sig separator string.
The simplest option is probably to declare it as a special case when the
first line of a flowing paragraph.
Clive D.W. Feather | Work: <clive(_at_)linx(_dot_)org> | Tel: +44 1733
Regulation Officer | or: <clive(_at_)demon(_dot_)net> | or: +44 973
London Internet Exchange | Home: <clive(_at_)davros(_dot_)org> | Fax: +44 1733
(on secondment from Demon Internet)