Index: roundup/cgi/client.py
===================================================================
--- roundup/cgi/client.py	(revision 4578)
+++ roundup/cgi/client.py	(working copy)
@@ -1024,7 +1024,7 @@
         message['Content-type'] = 'text/html; charset=utf-8'
         message.set_payload(content)
         encode_quopri(message)
-        self.mailer.smtp_send(to, str(message))
+        self.mailer.smtp_send(to, message.as_string())
     
     def renderFrontPage(self, message):
         """Return the front page of the tracker."""