Since Thomas Wouters kept complaining that he wants access to the the

Unix From lines, change the UnixMailbox class so that _search_start()
positions the file *before* the Unix From line instead of after it;
change _search_end() to skip one line before looking for the next From
line.  The rfc822.Message class automatically recognizes these Unix
From lines and squirrels them away in the 'unixfrom' instance variable.

Lib/mailbox.py

@@ -97,13 +97,16 @@ class UnixMailbox(_Mailbox):
 
         def _search_start(self):
                 while 1:
+			pos = self.fp.tell()
                         line = self.fp.readline()
                         if not line:
                                 raise EOFError
                         if line[:5] == 'From ' and self._isrealfromline(line):
+				self.fp.seek(pos)
                                 return
 
         def _search_end(self):
+		self.fp.readline()	# Throw away header line
                 while 1:
                         pos = self.fp.tell()
                         line = self.fp.readline()