3 bugs in Rmail

[Eli Zaretskii]

Would someone please take a look at these 3 bug reports?

  http://lists.gnu.org/archive/html/help-gnu-emacs/2011-01/msg00315.html
  http://lists.gnu.org/archive/html/help-gnu-emacs/2011-01/msg00316.html
  http://lists.gnu.org/archive/html/help-gnu-emacs/2011-01/msg00317.html

You will see in the followups that reverting to sendmail-user-agent
resolved all of them, so the problems are probably because we switched
to message-user-agent in Emacs 23.2.  I asked DJ Delorie to submit bug
reports, but I don't see he did.  However, I'm sure he will supply
details if needed.