Thunderbird Beta Notes

Version 56.0beta, first offered to Beta channel users on August 8, 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.

These release notes apply to Thunderbird version 56 beta 4 released October 17th, 2017.

What’s New

  • New

    An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.

  • New

    In Thunderbird 52 a new behavior was introduced for replies to mailing list posts: "When replying to a mailing list, reply will be sent to address in From header ignoring Reply-to header". A new preference mail.override_list_reply_to allows to restore the previous behavior.

  • Changed

    IMAP: When after sending a message storing that sent message fails, the message can now be stored in a local folder

  • Changed

    When messages are composed in paragraph format, "body text" and split mail quotes are converted to paragraphs when pressing the enter key

  • Changed

    Thunderbird now uses the latest Mozilla technology based on Rust for encoding messages

  • Changed

    Various improvements in the Thunderbird themes on all platforms, especially for Windows 10.

  • Fixed

    Under certain circumstances (image attachment and non-image attachment), attached images were shown truncated in messages stored in IMAP folders not synchronised for offline use.

  • Fixed

    IMAP UIDs > 0x7FFFFFFF not handled properly

  • Fixed

    Unwanted inline images shown in rogue SPAM messages

  • Fixed

    Contacts sidebar: Selection and context menu behavior

  • Fixed

    Deleting message from the POP3 server not working when maildir storage was used

  • Fixed

    Message disposition flag (replied / forwarded) lost when reply or forwarded message was stored as draft and draft was sent later

  • Fixed

    Inline images not scaled to fit when printing

  • Fixed

    Selected text from another message sometimes included in a reply

  • Fixed

    No authorisation prompt displayed when inserting image into email body although image URL requires authentication

  • Fixed

    Blank lines removed from plain text replies under some circumstances

  • Fixed

    Large attachments taking a long time to open under some circumstances

  • Fixed

    In search folders spanning multiple base folders clicking on a message sometimes marked another message as read

  • Fixed

    IMAP alerts have been corrected and now show the correct server name in case of connection problems

  • Fixed

    POP alerts have been corrected and now indicate connection problems in case the configured POP server cannot be found