andrew@wipux2.wifo.uni-mannheim.de writes,

> mail.local has code for escaping From but doesn't seem to do it.
> I noticed that "mail" has no problem with the above line appearing
> in a mail.

The rule that mail.local uses is that if the line starts with "From "
*and* the previous line was blank, it sticks a ">" in front; otherwise
it leaves it unchanged.  This gets along well with Berkeley Mail, which
requires the blank line to recognize a new message, but not so well with
other mailers.

Eric