----- Transcript of session follows -----
Traceback (most recent call last):
 File "/home/jacob/snippets/mail/handler.py", line 128, in ?
   main()
 File "/home/jacob/snippets/mail/handler.py", line 120, in main
   handle_register(conn, sender, username, authcode)
 File "/home/jacob/snippets/mail/handler.py", line 84, in handle_register
   send_response(sender, "Thank you! Further emails from this address (%s) will be recorded to your Snippets." % (sender, ))
 File "/home/jacob/snippets/mail/handler.py", line 19, in send_response
   smtp.sendmail("bot@snippetlog.com", target, "Subject: Snippets\r\nTo: %s\r\n\r\n%s" % (target, message, ))
 File "/usr/local/lib/python2.4/smtplib.py", line 695, in sendmail
   raise SMTPRecipientsRefused(senderrs)
smtplib.SMTPRecipientsRefused: {'': (553, '5.0.0 <>... User address required')}
554 5.3.0 unknown mailer error 1