SpamSieve, aka the best 30 bucks you’ll ever spend on your Mac, has just been updated to version 2.8.6.

SpamSieve is an eMail client plug-in/application that provides powerful Bayesian spam filtering – much more accurate than the Junk Mail filters provided by most mail apps. It’s dirt-simple to install and control – and can be customized on how it interacts with the rest of your mail sorting rules. Actually, after you break it in for a day or so, there’s very little to do. It just works.

The plug-in is compatible with most Mac OS X eMail clients, including Apple Mail, Entourage (v.X through 2011), Mozilla Thunderbird 2, Eudora 5.2 or later (Sponsored or Paid), GyazMail, Mailsmith, Emailer, Postbox, and PowerMail. SpamSieve requires Mac OS X 10.4 or later.

SpamSieve 2.8.6 includes the following improvements and fixes:

• Improved compatibility with Mac OS X 10.7 Lion.
• Various changes to improve SpamSieve’s filtering accuracy.
• Added support for Postbox 2.5.
• Updated the Setting Up Outlook instructions for Microsoft Office 2011 Service Pack 1.
• Worked around a rare OS/hardware condition that could prevent SpamSieve from launching.
• Apple Mail plug-in is better at reporting errors when it’s unable to fully load itself.
• Various clarifications to the manual.

A 30-day free trial is available.