Thunderbird Release Notes

Version 68.0, first offered to channel users on August 27, 2019

Check out "What’s New" and "Known Issues" for this version of Thunderbird below. As always, you’re encouraged to tell us what you think, or file a bug in Bugzilla. If interested, please see the complete list of changes in this release.

Thunderbird version 68.0 is only offered as direct download from thunderbird.net and not as upgrade from Thunderbird version 60 or earlier. A future version 68.1 will provide updates from earlier versions. If you have installed Lightning, Thunderbird's calendar add-on, it will automatically be updated to match the new version of Thunderbird. Refer to this Calendar troubleshooting article in case of problems.

System Requirements: • Window: Windows 7, Windows Server 2008 R2 or later • Mac: Mac OS X 10.9 or later • Linux: GTK+ 3.4 or higher. Details here.

What’s New

  • new

    File link attachments can now be linked to again instead of uploading them again

  • new

    Mark all folders of an account as read

  • new

    Run filters periodically. Improved filter logging.

  • new

    OAuth2 authentication for Yandex

  • new

    Language packs can now be selected in the Advanced Options. Preference intl.multilingual.enabled needs to be set (and possily also extensions.langpacks.signatures.required needs to be set to false)

  • new

    On Windows a 64bit installer and MSI package are now available, see the Thunderbird for Organisations page for details

  • new

    Added a policy engine that allows customized Thunderbird deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file

  • new

    TCP keepalive for IMAP protocol

  • new

    Full Unicode support for MAPI interfaces: New support for MAPISendMailW

  • new

    To protect your profile data against a downgrade, Thunderbird 68 may display a message "You have launched an older version of Thunderbird" and will not allow opening a specific profile. Workaround: start with option --allow-downgrade. See this support article for details.

  • new

    Calendar: Time zone data can now include past and future changes. All known time zone changes from 2018 to 2022 are included.

  • new

    Chat: In each conversation an individual spellcheck language can be selected now

  • changed

    Add-on support: Add-ons are only supported if add-on authors have adapted them

  • changed

    Dictionary support: Only WebExtension dictionaries are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension dictionaries.

  • changed

    Theme support: Only WebExtension themes are supported now. Both addons.mozilla.org and addons.thunderbird.net now provide WebExtension themes.

  • changed

    The stand-alone options window has been removed, all options are now shown in a tab

  • changed

    Changed UI when installing add-ons

  • changed

    Various theme improvements including a dark message list/thread pane

  • changed

    Application menu aka "Hamburger menu"

  • changed

    Improvements when entering, selecting and removing recipients in the Write window

  • changed

    FileLink: WeTransfer is already included. Dropbox and Box.com using the new WebExtensions FileLink API are available as add-ons, amongst others.

  • changed

    Text and background colors in the Write window and custom colors for tags are no longer restricted to a fixed 10x7 matrix of HTML colors

  • changed

    Composition text and background colors no longer sent by default. New option in "Tools > Options, Composition".

  • changed

    UI improvements for external and detached attachments, now showing as links with new menu option "Open Containing Folder"

  • changed

    Textual attachments (plain text, HTML, XML, etc.) are no longer displayed inline. Toggle preference mail.inline_attachments.text to display them inline again.

  • changed

    Improved phishing attempt detection for messages with certain forms

  • changed

    Improvements to scam warnings

  • changed

    Reply to self will now search all identities (default of preference mailnews.reply_to_self_check_all_ident changed to true)

  • changed

    Maildir now uses the message ID as file name and "eml" as file extension

  • changed

    Auto-compact threshold increased from 20 MB to 200 MB

  • changed

    Calendar: UI improvements for event dialog

  • changed

    Calendar: Thunderbird's calendar add-on Lightning now uses the same version numbering scheme

  • fixed

    Column choice and sort order in "Search Messages" dialog lost after relaunch

  • fixed

    Global indexer causing high CPU loads under some circumstances

  • fixed

    Tags set on IMAP folders sometimes not visible to other users

  • fixed

    "Contribute" button in add-on details not working

  • fixed

    SMTP password wasn't removed when account was deleted or server or user name were changed

  • fixed

    Mbox to Maildir conversion not working if Windows search integration is enabled

  • fixed

    Mails won't get removed from Trash folder using Maildir. Note: Other deletion issues related to Maildir may still persist.

  • fixed

    When sending of a message failed due a security issue, only "unknown error" was displayed. Now more details are given.

  • fixed

    Improvements of SMTP 5.7.1 message

  • fixed

    Calendar: Multiple connections with different users to the same CalDAV server not working

  • fixed

    Chat: Fixed XMPP authentication when using SASL

Known Issues

  • unresolved

    Edit tag not working (will be fixed in version 68.1)

  • unresolved

    Moving messages from "Search Messages" result dialog not working (will be fixed in version 68.1)

  • unresolved

    Issues with list of content types/actions for incoming attachments (will be fixed in version 68.1)