Anti-spam refers to any mechanism, software, or technology that prevents spam from reaching a users inbox. Email administrators use a variety of approaches to automating the anti-suspective process. Thunderbird has its built-in spam filter, which works when the user employs the junk tool button to mark a message as junk or legitimate. Comodo Dome Antispam is a business-based anti-spim software, which is in high demand because of its automatic containment and intelligent filtering features.”]
Source: https://hackercombat.com/best-anti-spam-email-filters-for-thunderbird/