[Spambayes] smtpproxy 500 error at end of smtp conversation

[Cameron Stone]

I've installed spambayes-1.0a4 and I'm liking it a lot.

However, in using the smtp proxy, I'm getting a 500 Unrecognized command error
coming just after the data is finished sending. I'm pretty sure it's being
generated by the my smtp server, and the proxy is just echoing it through.
However, it must be a response to something strange the proxy is sending at the
end of the data, but my knowledge of python and the Dibbler library is not good
enough to find the error myself.

I've tested this using telnet, and the same smtp conversation works directly,
but gets the error when sent to the proxy. The mail gets sent correctly both
times, but my mail reader doesn't close the compose window on sending because of
the error. I like using the smtp proxy to train the filter, so I'd rather not
get rid of it. Any ideas?

Here's the direct connection:
$ telnet smtp 25
220 smtp smtp ready
HELO phaedrus.cse.unsw.edu.au
250 smtp
MAIL FROM:<camerons at cse.unsw.edu.au>
250 OK
RCPT TO:<camerons at cse.unsw.edu.au>
250 OK
DATA
354 Start mail input
Subject: Testing smtp proxy using telnet
This is the data
.
250 Mail spooled locally
QUIT
221 smtp SMTP service closing

And the proxy connection:
$ telnet localhost 12345
220 smtp smtp ready
HELO phaedrus.cse.unsw.edu.au
250 smtp
MAIL FROM:<camerons at cse.unsw.edu.au>
250 OK
RCPT TO:<camerons at cse.unsw.edu.au>
250 OK
DATA
354 Start mail input
Subject: Testing smtp proxy using telnet
This is the data
.
250 Mail spooled locally
500 unrecognised command
QUIT
221 smtp SMTP service closing