Hi,
this morning I tried to send a reply to issue2550564 (tracker  
here), which failed on roundup@psf.upfronthosting.co.za with
the following traceback:

Final-Recipient: rfc822; roundup+roundup@psf.upfronthosting.co.za
Original-Recipient: rfc822;issues@roundup-tracker.org
Action: failed
Status: 5.3.0
Diagnostic-Code: x-unix; Traceback (most recent call last):   File
    "/home/roundup/roundup/bin/roundup-mailgw", line 6, in ?     run() 
 File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/scripts/roundup_mailgw.py",
    line 210, in run     sys.exit(main(sys.argv))   File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/scripts/roundup_mailgw.py",
    line 153, in main     return handler.do_pipe()   File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/mailgw.py", line
    554, in do_pipe     self.main(s)   File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/mailgw.py", line
    716, in main     return self.handle_Message(Message(fp))   File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/mailgw.py", line
    773, in handle_Message     self.mailer.bounce_message(message,
    [sendto[0][1]], m)   File
   
"/home/roundup/roundup/lib/python2.4/site-packages/roundup/mailer.py", line
    151, in bounce_message     part = MIMEText(error)   File
    "email/MIMEText.py", line 28, in __init__   File "email/Message.py",
line
    218, in set_payload   File "email/Message.py", line 258, in set_charset
    File "email/Encoders.py", line 63, in encode_7or8bit AttributeError:
'list'
    object has no attribute 'encode'

This looks like the same issue here.  Am I right?

Peter.