Excerpts from internet.ietf-822: 23-Sep-91 Question on encapsulation
James H. T. - HNL(_at_)verifo (851)
I probably missed it -- but how you quote a line in the message
that looks like an encapsulation boundry so it doesn't interfere
with processing?
You don't. After much debate, we found the quoting mechanisms all too
cumbersome. The encapsulation boundary must be selected in such a way
that it does not appear in the message body at all, and therefore no
quoting is needed. This isn't as bad as it sounds at first -- it is
easy to come up with a boundary-generating algorithm that is so unlikely
to conflict that you could probably not even bother to look. Doing it
more properly, you can bother to look and do a potentially costly "start
over" operation if there's a conflict, because such conflicts will be so
rare. -- Nathaniel