Thunderbird
Published by MZLA Technologies Corporation
Desktop email client with calendar, contacts and feed reading
Highlights
- Several IMAP or POP3 accounts with a unified inbox and message filters
- Built-in calendar with CalDAV, and an address book with CardDAV
- OpenPGP end-to-end encryption without an add-on, plus S/MIME
- Feeds and newsgroups read in the same window as mail
- Extended support release for people who prefer fewer updates
About this application
Thunderbird is a desktop email client that keeps messages on your own machine. It handles several accounts at once over IMAP, POP3 and SMTP, with a unified view across mailboxes, message filters, saved searches and a tagging system that survives across folders.
Mail is only part of it. The calendar is built in, reads and writes CalDAV and iCalendar, and sits next to an address book that syncs over CardDAV. Feeds and newsgroups are read in the same window. End-to-end encryption is available through OpenPGP without an add-on, and S/MIME is supported for organisations that use certificates.
The application is maintained by MZLA Technologies, a subsidiary of the Mozilla Foundation, and is funded mainly by user donations. Builds are published for Windows, macOS and Linux, with the extended support release available for people who prefer fewer, larger updates.
Where to get it
Linux
- Open on FlathubOpens in a new tabPackage repositoryFlathub
From the publisher
Install from a terminal
flatpak install flathub org.mozilla.ThunderbirdRead from the source on 07/27/2026
Not tied to one platform
- Open the publisher’s pageOpens in a new tabPublisher’s own site
From the publisher
Read from the source on 07/27/2026
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