You can add extra spam-filtering capabilities to SpamPal by installing Plugins.

Plugins are the second key to how SpamPal filters out the spam. SpamPal has a powerful plugin interface and documentation to allow others to add extra features to SpamPal. Plugins are available for Bayesian filtering, regular expression filtering, censoring web bugs, logging, spam quarantining, extra DNSBL blocking functions and more.

You can obtain plugins from the SpamPal website; install them in the plugins directory within the SpamPal installation and they will appear on this pane, but you will have to click on them and then click on Enable/Disable to enable them before they will work.

Try the core DNSBL filtering before adding plugins - the DNSBLs are very effective and may be all you need.

One good way of speeding up SpamPal and it's plugins, is by using Addional Options feature that allows you to disable plugins being called once you know a message is already going to be tagged as spam or whitelisted. By default this feature is not enabled for existing users; but I would strongly advise existing users to enable it.

By not calling plugins that do a lot of work (such as RegExFilter), you can significantly speed up your mail fetch. Obviously, you will know how best to optimise SpamPal to your own way of working.

This is done by clicking on SpamPal's options page, Plugins and then bring up the screen for each plugin you have enabled. The new setting is in the middle of this screen. For most plugins (with the possible exception of HtmlModify) you should check the box to disable the plugin for whitelisted mails; for many (e.g. UrlBody, Badwords and RegExFilter if you're not using the latter to whitelist mails) you should also check the box to disable the plugin for spam mails.

There are two status types you can use to select:

Whitelisted: This means that you have whitelisted (or auto-whitelisted) an email address.
Spam: This means that SpamPal knows an email is spam either via a dnsbl lookup or by another plugin.