How the Mozilla Thunderbird Spam Filter Works
The Bayesian analysis Mozilla Thunderbird uses for spam filtering assigns a spam score to each word and other parts of an email. Over time, it learns which words typically appear in junk email and which appear mostly in good messages.
How to Turn on the Spam Filter in Mozilla Thunderbird
To have Mozilla Thunderbird filter junk mail for you:
How to Prevent Mozilla Thunderbird From Overriding External Spam Filters
To have Mozilla Thunderbird accept and use spam filtering scores created by a spam filter that analyzes messages before Thunderbird receives them:
Blocking Senders Doesn’t Help
In addition to employing a spam filter, Mozilla Thunderbird blocks individual email addresses and domains. While this is a proper tool to avoid senders or automated software installations that keep sending unwanted emails, blocking senders does little to fight spam. Junk emails don’t come from identifiable stable email addresses. If you block the email address from which one spam email seems to come, there’s no noticeable effect, because no other spam email will ever come from the same address.
