Thunderbird incorporates a Bayesian spam filter, a whitelist based on the included address book, and can also understand classifications by server-based filters such as SpamAssassin. Thunderbird provides basic support for system-specific new email notifications and can be extended with advanced notification support using an add-on. On Linux-based systems, system mail ( movemail) accounts were supported until version 91.0. Features such as quick search, saved search folders ('virtual folders'), advanced message filtering, message grouping, and tags help manage and find messages. Thunderbird manages multiple email, newsgroup, and news feed accounts and supports multiple identities within accounts. Additional features are available from extensions. Thunderbird is an email, newsgroup, news feed, and chat ( XMPP/ IRC) client with personal information manager (PIM) functionality, inbuilt since version 78.0 and previously available from the Lightning calendar extension.

The project strategy was originally modeled after that of Mozilla's Firefox web browser and is an interface built on top of that web browser.

Thunderbird is an independent, community-driven project that is managed and overseen by the Thunderbird Council, which is elected by the Thunderbird Community. Mozilla Thunderbird is a free and open-source cross-platform email client, personal information manager, news client, RSS and chat client that is operated by the Mozilla Foundation's subsidiary MZLA Technologies Corporation. Albanian, Arabic, Armenian, Asturian, Basque, Belarusian, Breton, Bulgarian, Catalan, Chinese (Simplified), Chinese (Traditional), Croatian, Czech, Danish, Dutch, English (British), English (US), Estonian, Finnish, French, Frisian, Gaelic (Scotland), Galician, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian, Irish, Italian, Japanese, Kabyle, Korean, Lithuanian, Lower Sorbian, Norwegian (Bokmål), Norwegian (Nynorsk), Polish, Portuguese (Brazilian), Portuguese (Portugal), Romanian, Romansh, Russian, Serbian, Sinhala, Slovak, Slovenian, Spanish (Argentina), Spanish (Spain), Swedish, Turkish, Ukrainian, Upper Sorbian, Vietnamese, Welsh.Įmail client, personal information manager, instant messaging client, news client, feed reader

Firefox webmail