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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 81.0beta, first offered to channel users on August 26, 2020
PDF.js viewer now included in Thunderbird
Address book: Synchronization of CardDAV address books now supported
Calendar: Opening an existing event now opens summary dialog
Chat: Image based emoticons replaced with Unicode
Chat: Non-functional Twitter support removed
MailExtensions: messageDisplay APIs extended to support multiple selected messages
Message list not in focus at startup
Email filters reported failure when moving a message to original folder
Sending messages sometimes failed when recipients were in LDAP address book
Address book: Creating mailing list from contacts sidebar failed
Address book: Search box icon duplicated after toolbar customization
vCard 2.1 attachments not handled properly
Non-functional help menu items removed
Calendar: Event reminder details were unreadable
MailExtensions: browser.folders.delete failed on IMAP folders
MailExtensions: Content scripts in message composer did not work
OpenPGP enabled by default
OpenPGP: Disabled the use of MD5/SM2/SM3 algorithms
OpenPGP: Users with sub-identities were unable to encrypt or sign messages when switching identities
Message filters: Filters shown as enabled in configuration dialog were not always enabled
OpenPGP message security window did not support dark mode
Thread summaries were unreadable on macOS using dark mode
Adding custom headers in the addressing widget (preference mail.compose.other.header) did not work
Drag and Drop reordering of recipient pills now supported
Calendar: Remote calendar auto-detection now supported
OpenPGP: Some signature states reported as "mismatch" now report "unknown"
Privacy policy now displayed in a tab when updated
Installation of "legacy" MailExtensions now disabled
OpenPGP: Improvements to key importing when failures occur
OpenPGP: Decryption did not work with certain HTTP proxy configurations
OpenPGP: "Discover keys online" option did not work when searching for an email address
OpenPGP: Creating a new key pair did not automatically select it for use
News reader crashed when downloading new articles. See unresolved issues.
Button to restore default folder icon color was not keyboard accessible
Windows 10 high-contrast theme fixes
More theme fixes and improvements
Reply-To header moved in compose window; now appears under From header
OpenPGP: Do not show external key UI when disabled by preference
Calendar: Sidebar UI improvements
Dragging & Dropping recipient pills resulted in lost pills when an error was present
Spellcheck suggestions were difficult to read in dark theme
Calendar: Multiple password prompts opened
Linux Distributions: UI was not rendered completely when built without updater
New news articles are not downloaded