Assuming that you have already executed Spam Filtering for Thunderbird on your UNIX account, you can proceed to do Spam Filtering for Thunderbird. The premise is that your mail (which arrives at your UNIX account) is "tagged" with a Spam Score. It is also set with a Spam Hit Level of 5.0 (the default value), so that if the Spam Score is larger than this value, the mail is considered to be "Probable Spam". More technically, the value of X-Probable-Spam (a 'header' in the mail message) is evaluated as "yes".

This is the basis of the filtering that you will be performing using your Thunderbird filter. The filter can be used normally to make decisions based on other headers, such as the "Subject" line, or the "From" line. We are not concerned with these specific headers in the SPAM Filtering Method. Instead, we manually select a filter based on the X-Probable-Spam header.

Once you set up filtering on your Thunderbird application, you can fine tune your level of filtering (SPAM Hit Level) by re-running spamscript on your UNIX account. To set up Thunderbird's SPAM filtering, go to Thunderbird Filtering.