[Spambayes] Spam crashing sb_imapfilter.py

[Woo, Christopher]

Has anyone come across spam that crashes sb_imapfilter.py? I've been getting
one or two a week that will stop sb_imapfilter.py cold, and the only way I
can fix it is to go in manually and delete the offending spam. I've several
of these emails saved, and I can reproduce the error:

c:\spambayes\scripts\sb_imapfilter.py -c -e y
SpamBayes IMAP Filter Version 0.3 (April 2004)
and engine SpamBayes Engine Version 0.3 (January 2004).

Traceback (most recent call last):
  File "c:\spambayes\scripts\sb_imapfilter.py", line 857, in ?
    run()
  File "c:\spambayes\scripts\sb_imapfilter.py", line 847, in run
    imap_filter.Filter()
  File "c:\spambayes\scripts\sb_imapfilter.py", line 719, in Filter
    self.unsure_folder)
  File "c:\spambayes\scripts\sb_imapfilter.py", line 633, in Filter
    for msg in self:
  File "c:\spambayes\scripts\sb_imapfilter.py", line 528, in __iter__
    yield self[key]
  File "c:\spambayes\scripts\sb_imapfilter.py", line 577, in __getitem__
    msg.Save()
  File "c:\spambayes\scripts\sb_imapfilter.py", line 443, in Save
    self.as_string())
  File "C:\Python23\Lib\site-packages\spambayes\message.py", line 277, in
as_string
    return self._force_CRLF(email.Message.Message.as_string(self, unixfrom))
  File "C:\Python23\Lib\site-packages\email\Message.py", line 113, in
as_string
    g.flatten(self, unixfrom=unixfrom)
  File "C:\Python23\Lib\site-packages\email\Generator.py", line 103, in
flatten
    self._write(msg)
  File "C:\Python23\Lib\site-packages\email\Generator.py", line 131, in
_write
    self._dispatch(msg)
  File "C:\Python23\Lib\site-packages\email\Generator.py", line 157, in
_dispatch
    meth(msg)
  File "C:\Python23\Lib\site-packages\email\Generator.py", line 200, in
_handle_text
    raise TypeError, 'string payload expected: %s' % type(payload)
TypeError: string payload expected: <type 'list'>

==================
Is this something that the spammers are deliberately putting into their
emails? I have the email (and several others that cause crashes), just
didn't know if the list would take to kindly to have it attached to the
message.

Chris