email dispatcher disconnects

the email dispatcher disconnects with the following error message:

From: <email address hidden>
To: <email address hidden>
Subject: Supporter email.

User: erik

Email: <email address hidden>
Asking: sdvsdv
Product/config :
OS version: Linux
System information: Linux mambo 2.6.24-23-generic #1 SMP Thu Nov 27 18:44:42 UTC 2008 i686
Client generated case id: 5c044df4-e679-11dd-b83d-0019dbcdb73f

--- Data container dump ---
<SOAPpy.Types.structType v1 at 139648876>: {'username': 'erik', 'product': '', 'question': 'sdvsdv', 'useremail': '<email address hidden>', 'systeminformation': 'Linux mambo 2.6.24-23-generic #1 SMP Thu Nov 27 18:44:42 UTC 2008 i686', 'osversion': 'Linux', 'id': '5c044df4-e679-11dd-b83d-0019dbcdb73f'}
*** Method SubmitRequest exception *************************************
Traceback (most recent call last):
  File "/var/lib/python-support/python2.5/SOAPpy/Server.py", line 407, in do_POST
    fr = apply(f, ordered_args, named_args)
  File "../supporter/servers/supporterd.py", line 128, in SubmitRequest
    real_case_id = self.dispatcher.send( incoming_srt )
  File "/home/erik/workspace/supporter/src/supporter/servers/dispatchers/email.py", line 95, in send
    if smtpresult:
  File "/usr/lib/python2.5/smtplib.py", line 689, in sendmail
    (code,resp) = self.mail(from_addr, esmtp_opts)
  File "/usr/lib/python2.5/smtplib.py", line 465, in mail
    return self.getreply()
  File "/usr/lib/python2.5/smtplib.py", line 355, in getreply
    raise SMTPServerDisconnected("Connection unexpectedly closed")
SMTPServerDisconnected: Connection unexpectedly closed
************************************************************************