Thunderbird Updates & Release Notes

What’s New

• OpenPGP key properties can print debug information to the Error Console
• External browser login flow enabled for Yandex
• Custom OAuth support for issuer ID and client secret field for IMAP and POP3
• Custom OAuth support for POP3
• Enterprise policy DisableUpdateSettings prevents users from changing update settings
• Enterprise policy DisableDataCollectionSettings prevents users from changing data collection setting
• Enterprise policy DisableMessageForwardingFilters prevents message filters from automatically forwarding messages

Changed

• Preference mail.offer_experimental_features renamed to mail.experimental_features_settings.enabled
• Thundermail built-in add-on updated to v2.0.11

Fixed

• Detached attachment links were truncated when folder path contained &
• Opening a PDF attachment in a tab displayed empty tab
• POP3 folders with names over 55 characters could become duplicated after upgrading
• Folders with invalid filename characters could show hashed names if cache was lost
• Save All, Detach All, and Delete All failed after deleting one attachment
• Renaming folders could reset folder settings
• Subscribing an IMAP folder and subfolder together failed to subscribe the subfolder
• Some newly fetched POP messages were not marked with new star after startup
• Sorting after deleting the only child message removed the parent from view
• OpenPGP signing failed with external GnuPG when the primary key could not sign
• Remote content could load in encrypted messages opened from files
• Sent message with expired S/MIME certificate wrongly showed untrusted CA warning
• PDF attachments from compose windows could wrongly be detected as HTML
• Saving unconfirmed recipients could create invalid address pills with >>
• External browser OAuth failed when a browser preconnection closed first
• Users could not set up custom OAuth for Exchange accounts
• Pressing Enter on Windows system tray icon did not restore Thunderbird window
• Inline attachments incorrectly changed the message channel content type
• Message loading was slow while discovering large numbers of IMAP folders
• SMTP authentication failed when usernames contained non-ASCII characters
• Unsupported EWS archive folder prevented all mailbox folders from syncing
• Manual Get Messages failed after startup until toggling offline mode
• Case differences in CalDAV email addresses caused duplicate invitations
• Accepted CalDAV invitations could be saved to the wrong calendar

Visual and UX improvements

Security fixes

As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla

Original source

What’s New

S/MIME popup shows signature, digest, encryption algorithms and key sizes

Default address book for manually added contacts configurable with mail.addr_book.add_item_default_uri

Enterprise policy DisableQRExport can disable QR export

OAuth add-ons can override built-in settings for selected domains and hostnames

Manual account config streamlined with Exchange, Graph, and custom OAuth support

Custom OAuth support for IMAP and SMTP servers

PKCE and external browser fields added to custom OAuth settings

Enterprise policy DisableExperimentalFeatures for disabling experimental features

Fixed

Unread count dock badge disappeared on macOS restart when no mail window opened

IMAP tags did not sync automatically across clients

Embedded SVG images appeared broken when Display Attachments Inline was disabled

Holding arrow keys failed to smoothly navigate the folder pane

Mark and Tag menu bar items were disabled in search results

Quick Filter ignored address book display names shown in message lists and headers

Attachment filters could disappear or return no results in global search

Body search failed for quoted-printable messages ending on a soft line break

Failed encrypted send did not preserve draft

Failed account setup left an incoming server that blocked account recreation

Removing an account did not remove its OAuth token from the password manager

Account Hub prompted for calendar credentials immediately after successful login

Filters could copy empty messages to Local Folders during startup mail download

Closing message filters wrongly warned completed newsgroup filters were running

Autoscroll icon was missing directional arrows in scrollable messages

Apple Mail text attachments may not appear in MIME messages

Forwarded messages could display incorrect encoding

Thunderbird could crash due to improper database memory handling

Thunderbird could crash on shutdown while waiting for OAuth2 password entry

Thunderbird could crash while loading mail folders

Custom OAuth could not be disabled

Legacy IMAP tag changes were not sent to the server and reverted after refresh

Deleting an Exchange account retained the outgoing server settings

CalDAV calendars with offline support could stop fully synchronizing events

Offline cached ICS calendar changes were silently lost after reconnecting

Thunderbird upgrade disabled composition toolbar

Thunderbird upgrade disabled Settings menu for versions before macOS 13

Windows jump list menu no longer functioned correctly

Visual and UX improvements

Security fixes

As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla

Original source

What’s New

Preview functionality for attachments on macOS

CMS message with AuthEnvelopedData can be decrypted properly in Thunderbird

Global search results can open in list view by default with new setting

"Copy To" folder context menu added for message/rfc822 attachments

Optional system tray mode that hides Thunderbird when the last window closes

Support for dragging message/rfc822 type MIME attachments to folder tree

Microsoft Graph enabled for Microsoft 365

Fixed

Remote content warnings appeared despite sender block exceptions being applied

Collapsed saved-search folders did not deselect their subfolders

Server-designated special folder flags could be removed until restart

Messages could render excessive trailing blank lines

Copying a message subject included the "Subject:" label in copied text

Moving IMAP folders to Local Folders could delete messages after copy failures

7-bit clean unobtrusive signature payloads were unnecessarily base64 encoded

DisablePasswordReveal policy failed to prevent revealing saved passwords

Account setup tried local-part usernames before full email addresses

Read-only CardDAV address books were incorrectly treated as writable

Autoscroll icon was missing directional arrows in scrollable messages

Blank 1970-dated messages could appear from incomplete message file copies

Opening drafts or templates with invalid quoted-printable data could crash Thunderbird

Thunderbird could crash when inserting a message header into database cache

IMAP repeatedly notified for messages already read on another device

Dragging EWS search folders to Trash caused Thunderbird to crash

Folder compaction displayed incorrect disk space recovery estimates

Custom OAuth settings for EWS account overwrote original account's settings

Thunderbird could crash when going offline with an active IMAP IDLE connection

Thunderbird could crash while running online mail search

Exchange accounts could show repeated false login failures during authentication

Expired newsgroup articles showed an insecure "click here" purge link

IMAP attachments appeared empty after messages were moved by filters

Default special-folder names could reference nonexistent server folders

Thunderbird macOS fell back to Software WebRender after GPU process launch failures

New RSS subscriptions used updated dates instead of published dates

Calendar sort order was not preserved across Thunderbird restarts

"All calendars are disabled" banner reappeared after enabling a calendar

Dismissed CalDAV reminders could permanently stop future event notifications

Read-only CardDAV calendars were incorrectly treated as writable

CalDAV sync failed when server responses used UTF-16 encoding

Visual and UX improvements

Security fixes

As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla

Original source

What’s New

Unified folders now display account color indicator with account name tooltip

OAuth login for mail accounts now opens in default web browser

Thundermail services can now be used without installing an add-on

OAuth responses now verify issuer fields and reject missing required issuers

Changed

Removed Odnoklassniki chat setup and directed users to XMPP configuration

Fixed

Ctrl+S did not save PDF attachments opened in Thunderbird tabs

TLS errors incorrectly reported all unknown failures as untrusted certificates

Thunderbird could crash during shutdown

Thunderbird could crash when copying an empty list of messages

New mail alerts incorrectly sized or positioned on some multi-monitor setups

Old IMAP profile migration deleted INBOX and other mailbox files

Space bar did not scroll in PDF attachments opened from emails

'Search Messages' shortcut (Ctrl+Shift+F) failed in standalone message window

Folder location widget used non-localised name

Empty confirmation dialog when more messages opened in tabs than mailnews.open_tab_warning

Removing tags from IMAP messages could fail and tags reappeared after refresh

Folder pane could not be horizontally resized in additional 3-pane tabs

Global search failed to display inaccessible messages found in local folders

Numeric subfolders were sorted alphabetically instead of naturally

Virtual folder folder-picker showed unlabeled IM account as selectable folder

Virtual folders failed to preserve the online search setting

Apple Mail OpenPGP emails failed to decrypt due to hidden recipient key ID

OpenPGP import of public key with experimental packets failed with unclear error

Performance issue when decrypting encrypted messages

Opening messages with OpenPGP keys was slow and blocked the UI for large keyrings

OpenPGP key refresh failed when fingerprint lookup returned multiple results

Invalid S/MIME encryption certificate caused misleading send errors

Esc cleared quick filter pin after changing folder

Dragging email address between compose windows failed to add recipients

Thunderbird could crash when using Find and Replace All

Sending Message dialog got stuck on "Filter complete." after successful send

Compose with PDF attachments opened PDFs instead of creating a new email

Attachments opened via -compose on Windows could use incorrect filenames

Ctrl+Enter opened attachment instead of sending the message

Compose window remained open when delayed sending was enabled

Account hub showed connection security instead of actual authentication method

Account Hub GSSAPI autoconfiguration incorrectly prompted for a password

New identity dialog lacked reply-matching and end-to-end encryption settings

Account Hub manual EWS setup lacked OAuth authentication option

Thunderbird could fail to shut down cleanly during active OAuth requests

Account Hub kept OAuth selected after changing to hostname without OAuth support

Account Hub showed a false error when returning from EWS manual configuration

Account Hub autodetect wrongly prompted for a password when auth was unavailable

QR exports with SMTP passwords generated invalid data for Thunderbird for Android

Message Filters 'Run Now' button remained disabled after filter run or mail check

Redirected CardDAV URLs resolved relative URLs against the wrong host

Thunderbird could crash when completing folder copy/move

Forwarding some Apple Mail messages incorrectly attached inline text as a file

Auto-compaction could corrupt database and cause crashes during syncs

NNTP server with invalid TLS certificate could not be added to certificate exceptions

Sent message in EWS account showed message as unread in the sent items folder

EWS NTLM authentication triggered login failures despite successful syncs

Saving inline Exchange images used incorrect filenames and file types

Cancelled message send could not be retried and hung with SMTP timeout errors

EWS folders failed to show new mail notifications until the folder was selected

Corrupted NNTP account data caused excessive memory use and startup crash

Multiple selected IMAP folders could not be moved or deleted together

Non-Latin IMAP keywords were lowercased and encoded incorrectly as MUTF-7

Message tags were lost when moving folder from local folder to IMAP folder

Reply All button was missing for some EWS messages with multiple recipients

EWS users could not permanently delete individual Trash messages

Removing a chat account threw an exception and failed to clear the UI

Primary Password policy was detected but not enforced for saved account passwords

Copying one recurring event occurrence failed to set the date when pasted

Calendar invites were incorrectly marked processed after calendar sync completed

ICS event comments were not displayed in Thunderbird event details

Visual and UX improvements

Security fixes

As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla

Original source