SPAMfighter is an anti-spam software that can be integrated with Microsoft Outlook, Outlook Express, Windows Mail, and Windows Live Mail. The software uses a community-based approach to detect and block spam emails, with users reporting spam emails that are then added to the global database. The software also includes a language filter that can detect and block emails written in a specific language, as well as a whitelist feature that allows users to add trusted senders. Additionally, the software includes a feature that can automatically delete emails with certain keywords or phrases.