Problem with struct.unpack in oe_mailbox.py

Hi,

I previously sent this mail to the spambayes users list, without
response.  Apologies for the repost... I'm hoping it's more
appropriate here:-

I'm running spambayes (1.0.4-3) on Debian unstable with Python 2.4.4c0
and a custom compiled 2.6.17 kernel. I'm using an AMD64 chip.

sb_server starts up ok and proxies pop3 and smtp connections ok.
I can train from the commandline ok.

The problem comes when I try to train it from the web interface (using
either mbox or dbx format).  It bombs with the following error:-

----------------
Traceback (most recent call last):

  File "/usr/lib/python2.4/site-packages/spambayes/Dibbler.py", line 470, in found_terminator
    getattr(plugin, name)(**params)

  File "/usr/lib/python2.4/site-packages/spambayes/UserInterface.py", line 494, in onTrain
    content = self._convertToMbox(content)

  File "/usr/lib/python2.4/site-packages/spambayes/UserInterface.py", line 536, in _convertToMbox
    content = oe_mailbox.convertToMbox(content)

  File "/usr/lib/python2.4/site-packages/spambayes/oe_mailbox.py", line 444, in convertToMbox
    if header.isValid() and header.isMessages():

  File "/usr/lib/python2.4/site-packages/spambayes/oe_mailbox.py", line 117, in isValid
    return self.getEntry(0) == dbxFileHeader.MAGIC_NUMBER

  File "/usr/lib/python2.4/site-packages/spambayes/oe_mailbox.py", line 126, in getEntry
    self.dbxBuffer[dbxEntry * 4:(dbxEntry * 4) + 4])[0]

error: unpack str size does not match format
----------------

I'm wondering whether this is something to do with my machine
architecture and the sizes of datatypes?  But I'm stabbing in the
dark.

I can easily disable dbx support by commenting out..
content = oe_mailbox.convertToMbox(content)
.. around line 536 of UserInterface.py, and this does enable me to
train on mbox format via the web interface, but I'd rather keep dbx
support if possible.  I don't speak Python so commenting out the
offending code was about as far as I could go.

Any ideas?

Thanks,

Matt