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Subject: Re: Gnus, movemail, POP3, trailing empty lines
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> Let's try that again: tell me, how does this algorithm know that a given
> quoted "From " line in the body of the message is one that should be

I think what you're missing is that you *don't* just quote ^From
lines, you also quote ^>From, iteratively... you have to, it's the
only way to do it reliably. So, (xx inserted so the example doesn't
get mangled)

xxFrom
xx>From
xx>>From

in an actual *message* gets stored as

xx>From
xx>>From
xx>>>From

and then the MTA before displaying it strips one > from any >*From
line (that's a regexp "kleene" * not a glob *) yielding

xxFrom
xx>From
xx>>From

That's the Right Way(tm) to quote From lines.  I've *never* seen a
mailer actually do that; they all corrupt messages instead, taking
only any xxFrom and making it xx>From, then any xx>From and making
xxFrom even if it wasn't one it converted.