--- email/generator.py.orig	2011-01-13 12:20:26.000000000 -0500
+++ email/generator.py	2011-01-13 12:23:38.000000000 -0500
@@ -226,7 +226,8 @@
             # Create a boundary that doesn't appear in any of the
             # message texts.
             alltext = self._encoded_NL.join(msgtexts)
-            msg.set_boundary(self._make_boundary(alltext))
+            boundary = self._make_boundary(alltext)
+            msg.set_boundary(boundary)
         # If there's a preamble, write it out, with a trailing CRLF
         if msg.preamble is not None:
             self.write(msg.preamble + self._NL)