I have been looking into options to either start using the bogofilter included or export the spamassassin training that has been done over the past year or so into bogofilter.
From the bogofilter site, this looks like it would work for a good initial traing before the switch to nice bayes.
For those that no more about this then me, would this work?
How can I use SpamAssassin to train Bogofilter?
If you have a working SpamAssassin installation (or care to create one), you can use its return codes to train bogofilter. The easiest way is to create a script for your MDA that runs SpamAssassin, tests the spam/non-spam return code, and runs bogofilter to register the message as spam (or non-spam). The sample procmail recipe below shows one way to do this:
BOGOFILTER = "/usr/bin/bogofilter"
BOGOFILTER_DIR = "training"
SPAMASSASSIN = "/usr/bin/spamassassin"
* ? $SPAMASSASSIN -e
#spam yields non-zero
#non-spam yields zero
| $BOGOFILTER -n -d $BOGOFILTER_DIR
| $BOGOFILTER -s -d $BOGOFILTER_DIR
| $BOGOFILTER -p -e