All coders who want to contribute in Spamihilator’s development are welcome to write their own filter plugin. All you need is the Plugin Software-Development-Kit (SDK):

Plugin SDK 2.6.1
Sep/18/2011, 139 KB, 12013 hits

The SDK contains all files needed to write a plugin. Furthermore there is an interface documentation and sample plugins.

You just created a plugin and you want to publish it on this website now? Send a short message to me and become a plugin author!