Spam level headers in Thunderbird

Spamassassin adds several special headers to every email that it scans. One of these is X-Spam-Level, that is, the degree of “spaminess” that the email scored.

thunderbird-headers

When training your spam filters, it can be useful to see the score of each scanned email. In Thunderbird, this can easily be done by changing a setting using the config editor. In the field mailnews.headers.extraExpandedHeaders add the value X-Spam-Level.

thunderbird-setextra

As a bonus, to see the user agent string, you can also use the config editor by setting mailnews.headers.showUserAgent to value true. This simple flag renders a separate plugin for this functionality superfluous.

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