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Here is a patch against pop3 1.3q to bring it to 1.3r.  It should generate
a Content-Length header with the same value as the Lines header Gnus
creates (which is converted to X-Content-Length by Gnus somewhere along the 
line).  This should hopefully prevent unescaped envelopes from being a
problem.

Note: it uses `count-lines-buffer' from simple.el, which might not be part
of FSF Emacs (it is part of XEmacs).  If this is the case, does FSF Emacs
have a more or less equivalently useful function, or am I going to have to
roll my own?