[Spambayes] Newbie Q: How do I classify a mbox without training?

[Nicke Nicke]

Subject says nearly all. Checked the FAQ and searched the archive but still 
don't have a clue. I suspect this question is too basic!

I have a UNIX mbox file of mixed messages which I'd like to classify, but 
without training on the sample.  How do I do this? The Web interface only 
allows one message at a time.

Running Spambayes & pop3proxy on WinXP.

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