Broken reference to oe_mailbox?

$ sb_imapfilter.py
opened existing cache with 238 A records and 0 PTR records
Traceback (most recent call last):
  File "/usr/local/bin/sb_imapfilter.py", line 5, in <module>
    pkg_resources.run_script('spambayes==1.1b1', 'sb_imapfilter.py')
  File "build/bdist.freebsd-6.2-RELEASE-amd64/egg/pkg_resources.py", line 448, in run_script
  File "build/bdist.freebsd-6.2-RELEASE-amd64/egg/pkg_resources.py", line 1166, in run_script
  File "/usr/local/lib/python2.5/site-packages/spambayes-1.1b1-py2.5.egg/EGG-INFO/scripts/sb_imapfilter.py", line 138, in <module>
    from spambayes.UserInterface import UserInterfaceServer
  File "/usr/local/lib/python2.5/site-packages/spambayes-1.1b1-py2.5.egg/spambayes/UserInterface.py", line 78, in <module>
    from spambayes import oe_mailbox
  File "/usr/local/lib/python2.5/site-packages/spambayes-1.1b1-py2.5.egg/spambayes/oe_mailbox.py", line 53, in <module>
    from spambayes import oe_mailbox
ImportError: cannot import name oe_mailbox

-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com