Existing users, 
I patiently waited until I had enough junk to properly train SpamSieve, followed the directions to a "T" and tried to open my next incoming mail item. Apple's Mail crashed. Not until I completely uninstalled SS and all its components, restarted the computer, and finally deleted Mail's preferences, was I able to use Mail again. I lost my accounts with the preferences and had to recreate them.
I was going to email the developer but couldn't since Mail wouldn't work. Should've used the the Web-based email I guess. It was such a time-waster I probably won't try to SS again. However, I'd be interested to know if this is a bug and if it gets fixed.
SpamSieve
Bayesian spam filter for most email clients.
Version: 2.7.7
Crashed Mail
Feedback Type: Troubleshooting Report
Contributed by: izann Sunday, March 05 2006 @ 07:27 PM PST
Product Platform: MacOSX
Used Product For: Less than a month
System Info:
Comments
More Info - michaeltsai
Since uninstalling SpamSieve didn't stop the crash, that indicates that SpamSieve wasn't the cause of the crash. Deleting Mail's preferences worked because that turns off the other installed plug-in(s).Monday, March 06 2006 @ 07:14 AM PST
Crashed Mail - michaeltsai
This crash was almost certainly caused by another Mail plug-in, not SpamSieve. Installing SpamSieve causes Mail to load any installed plug-ins, and you may have had one or more dormant ones that are incompatible with the latest version of Mail. Most commonly, this is:
/Library/Mail/Bundles/PGPmail.mailbundle
Removing the plug-in should stop it from crashing.
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Monday, March 06 2006 @ 07:09 AM PST