When downloading certain types of spam, SpamBayes fails and logs the following:
error: uncaptured python exception, closing channel <sb_server.ServerLineReader connected <server address>:110 at 0x1243fa8> (socket.error:(10035, 'The socket operation could not complete without blocking') [asynchat.pyc|handle_read|88] [asyncore.pyc|recv|356])
I tried this with several different mail clients so I believe the problem is with SpamBayes.
Have attached what I figure should be useful.
Spam sample 1
Spam sample 2
PCap-format packet dump
SpamBayes server log