Pros and cons
Is good to put on the table 2 fairy good spam detectors, but...
- Extremelly small sample (not puting the mailing lists on the whitelist could give a better hint on false positives, even with such a small sample). The accuracy results could be very different in the long run.
- AFAIK spamassassin includes bayesian filtering by now, and anyway can use bogofilter. Filtering by keywords or searching for duplicate messages a la razor is mostly useless by now for most spam, as they include random text, intercalate random html comments inside keywords or even changes letters with symbols (i.e. w0rd instead of word).
- Put a reference to POPFile (a perl pop3 proxy with bayesian clasification) but not to bogofilter, that work in the same way than spamassassin and spastic. I'm not saying that popfile is bad, in fact, is THE way I'm using right now to filter spam, but I don't think that it should be used at server level like the other two.