Thunderbird Notes

Version 52.0, first offered to Release channel users on April 4, 2017

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.

System Requirements:

Window: Windows XP, Windows Server 2003 or later

Mac: Mac OS X 10.9 or later

Linux: GTK+ 3.4 or higher

Details here.

What’s New

  • New

    Folder pane toolbar and folder view selector (replacement for folder view arrows)

  • New

    Optionally remove corresponding data files when removing an account from Thunderbird

  • New

    Import settings from Becky! Internet Mail

  • New

    Possibility to copy message filter

  • New

    Dictionary setting is restored when editing a draft. Content-Language header (RFC 3282) transmitted with message

  • New

    Calendar: Event can now be created and edited in a tab

  • New

    Calendar: Processing of received invitation counter proposals

  • New

    Chat: Support Twitter Direct Messages

  • New

    Chat: Liking and favoriting in Twitter

  • New

    Chat: XMPP: Support SASL SCRAM authentication mechanism

  • New

    Chat: Support Jabber/XMPP Message Carbons (XEP-280)

  • Changed

    IMPORTANT: The way images are included in a compose window has changed. Images are now included as data URIs and not as references to parts of other messages or operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. Images linked from locations on the internet will no longer be downloaded and attached to the message automatically. This can be changed for each image individually via the Image Properties dialog or globally by setting the preference mail.compose.attach_http_images.

  • Changed

    Correspondents column now default for all new folders, can be switched off with preference mail.threadpane.use_correspondents

  • Changed

    When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header

  • Changed

    Notifications on Mac: Some manual adjustments might be necessary in the Mac Notification Center (System Preferences - Notifications - Thunderbird) after an upgrade to Thunderbird 52.

  • Changed

    On Linux PulseAudio is now required to play sound

  • Changed

    Formatting toolbar is now left in place when delivery format is switched to plain text only

  • Changed

    Messages in IMAP folders read on external device are now filtered by default

  • Changed

    Folders backed by mbox storage larger than 4GB are supported without warning (unless preference mailnews.allowMboxOver4GB is set to false)

  • Changed

    IMAP caching now uses Mozilla's latest caching technology

  • Changed

    The keyboard shortcut to insert hyperlinks into a compose window was changed from CTRL+L to CTRL+K to align with Office applications

  • Changed

    Chat: Removed Yahoo! Messenger support (since Yahoo removed support)

  • Fixed

    Message preview pane non-functional after IMAP folder was renamed or moved

  • Fixed

    Editing in paragraph format: Pressing Shift+Enter sometimes doesn't move the cursor to the next line

  • Fixed

    Various corrections when composing messages in paragraph format

  • Fixed

    Paste as quotation doesn't always work

  • Fixed

    Long lines in plain text replies not properly wrapped

  • Fixed

    Undesired white-space before signature in paragraph mode

  • Fixed

    When attachment unavailable, compose shows endless "Attaching..." message instead of error

  • Fixed

    Text encoding of reply sometimes incorrect (uses encoding of last viewed message)

  • Fixed

    Text encoding of message display, reply or forwarded message sometimes incorrect (uses encoding of attachment)

  • Fixed

    Delivery Format not preserved for saved drafts (Auto-Detect|Plaintext|HTML|Both)

  • Fixed

    Reply to own e-mail does not reply with the correct identity

  • Fixed

    IMAP message part caching

  • Fixed

    Links with escaped non-ASCII (international) characters can't be clicked

  • Fixed

    Calendar: Events specified in timezone "local time" generate alerts in UTC time

  • Fixed

    Chat: XMPP Resource collisions

  • Fixed

    Various security fixes

Known Issues

  • unresolved

    Large attachments may not be shown or saved correctly if the message is stored in an IMAP folder which is not synchronized for offline use. Workaround: Set preference browser.cache.memory.max_entry_size to the value of -1 (unlimited) and create integer preference browser.cache.memory.capacity with the value of 200000 (200 MB, 25 MB per message).

  • unresolved

    Crash when compacting IMAP folder

  • unresolved

    Crash due to incompatibility with McAfee Anti-SPAM add-on. Workaround: Start in safe mode and disable McAfee Anti-Spam Extension

  • unresolved

    Large number of blank pages being printed under certain circumstances. To fix this problem, remove all printer specific preferences in the configuration editor.

  • unresolved

    Background images not working and other issues related to embedded images when composing email

  • unresolved

    Clicking on a link in an email may not open this link in the external browser. Fix provided in 52.0.1 (upcoming)