Release Notes

Visual signatures can be added to PDF attachments opened in Thunderbird

'Copy Message Link' and 'Copy News Link' added to header pane 'More actions'

Accessiblity is improved in various tree views

Added 'Archive' action to mail notifications

Add "Show Full Path" folder pane option for compact view modes

Unified folders now display account color indicator with account name tooltip

Folder copy enabled within mail server accounts and local folders

'Reset Folder Order' option added to folder pane to reset custom folder sorting

Add `mail.useLocalizedFolderNames' to toggle special folder name localization

'Favorites' added as destination for 'Move To' and 'File' buttons

Composer now shows a warning if user's configured OpenPGP key expires soon

Enabled configuration of preferred OpenPGP keyserver via the UI

Add mail.openpgp.load_untested_gpgme_version to load untested GPGME version

Added support for generating Unobtrusive Signatures (OpenPGP)

Implemented option to show only messages without any tag

Message body search enabled for OpenPGP and S/MIME encrypted messages

SecurityDevices enabled in enterprise policies

Enable support for DNS over HTTPS

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

Enable the "Sign in with Thundermail" button in Account Hub

Account hub is opened on the first run of Thunderbird

Account Hub email manual config option added

Enable Thundermail OAuth sign-in with account auto-configuration

Address book cards can be copied to the clipboard as vCard

Enable exporting selected address book cards

Custom Accent Color can be chosen in Appearance Settings

Enable support for Microsoft Exchange via Exchange Web Services

Calendar month/multiweek views are now scrollable with touch screen

Tasks can be sorted by created or modified date

PDF pages can be reorganized directly in the PDF viewer

'Copy Message Location' removed from mail context menu

Read folders are now removed from Unread Folders view

Special folders are now localized based on a restricted set of names

OpenPGP public key no longer attached by default in signed-only messages

Address books are now created in Account Hub

Yahoo, AT&T, AOL accounts migrated to OAuth 2.0 with PKCE for improved security

GMail OAuth updated to use PKCE

Skype has been retired and therefore dropped from Address book IM selection

Removed pref default_supports_diskspace.{HOST}

Removed pref default_offline_support_level.{HOST}

Removed Odnoklassniki chat setup and directed users to XMPP configuration

Use of the string "Junk" has been replaced with "Spam"

Updated about:rights to replace local with hosted url

Stop shipping 32-bit Linux x86 binaries

'Hide completed tasks' now also hides cancelled tasks

Stop shipping 32-bit Linux x86 binaries

Thunderbird could crash when parsing message state

The English string for the Angry emoji was incorrectly named as the Yell emoji

Notification sounds did not respect operating system's do-not-disturb mode

Non-English localized Thunderbird created English special folders on first start

Copying text from some error alerts was not possible

Fastmail CalDAV app password access failed due to forced OAuth regression

Thunderbird could crash in server subscription logic

Could not distinguish folders with same name in 'Recent Destinations' and 'Favorites'

Donation banner stole focus when Thunderbird was running in the background

Unknown command-line arguments passed to Thunderbird did not print warning

Thunderbird could crash when processing new incoming messages

Spam messages triggered new mail notifications before being moved to Spam folder

Web pages with bad certificates displayed as blank

Memory leak after opening New Window from folder pane context menu

Importing a vCard only displayed VCF files in the file picker

Calendar view tabs were not properly keyboard accessible

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

TLS errors incorrectly reported all unknown failures as untrusted certificates

Thunderbird could crash when copying an empty list of messages

Incorrect roaming data directory caused regression on Windows and macOS

Changing to new drafts folder and then back did not correctly restore the folder

Message headers were re-downloaded at every startup

Old IMAP profile migration deleted INBOX and other mailbox files

'Search Messages...' dialog could not be opened outside the email tab

Option did not exist to create new address book under File -> New

Newly created folder was missing under "Recent" when moving a message

Could not compose new message if the folder pane was empty

'Delete' was missing from context menu when multiple IMAP folders were selected

Compacting multiple folders failed and did not compact

Shift-click for 'Edit' button in drafts header view did not work

"Replace All" in Compose did not update plain text until dialog closed

Status bar messages displayed unlocalized folder names or IMAP mailbox names

Saved email filenames were not not always cross-platform safe

Space bar did not scroll in PDF attachments opened from emails

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

Toggling dark message mode did not restore focus and scroll position

'Show remote content' did not display remote content for EML message

Emoji sequences were not properly handled in subject lines

'Delete' button in unified toolbar could delete attachments instead of message

"Repair text encoding" could duplicate recipient and attachments

Some IMAP emails showed current time instead of correct received date

Deleting a single message in folder using 'Group by Sort' failed after CTRL+A

New newsgroups were not added in alphabetical order by default

Sorting by threads only brought threads with unread top messages to the top

News message marked read after NNTP error prevented retrieval from server

'Recent destinations' submenu was not sorted by time of modification

Account column could display incorrect account name

'Tag' submenu of mail context menu could be populated incorrectly

Unified archive subfolders could show wrong names and no messages

Moving saved search/virtual folder under IMAP could fail

New Folder dialog allowed invalid folder creation without a selected parent folder

New/unread messages in collapsed thread were not obvious enough

Pressing Delete on Trash folder could remove it without confirmation

Renaming of a 'unified folder' created a duplicate

Clicking on a folder in the folder pane did not always open folder

Messages nested deeper than 255 levels disappeared from threading view

Performing Delete followed by Undo on thread parent message could corrupt view

Single messages still appeared collapsible after thread members were deleted

Updated threads remained misordered until folder refresh or resort

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

Some folders showed new mail count prior to receiving mail

Menu Bar -> View contained duplicate accelerator keys

Unified toolbar Spam button did not switch to "Not Spam" when spam message selected

Warning was not logged if mail.openpgp.alias_rules_file file did not exist

Not all headers were signed when creating digitally signed OpenPGP email

When configuring external GnuPG, user was not promted to import public key

"Open and Show" for OpenPGP-signed message (.eml) did not work

Invalidly signed unencrypted emails were indicated as worse than unsigned ones

Reason for revoked certificate was not shown

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

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

OpenPGP key refresh failed when fingerprint lookup returned multiple results

Encrypted Gmail CSE emails with outer opaque S/MIME were not readable

Invalid S/MIME encryption certificate caused misleading send errors

"Search Messages" search did not finish due to unparsable local folders

Search results showed older irrelevant emails before newer exact matches

Filter search on Body missed draft messages containing German umlauts

Esc cleared quick filter pin after changing folder

Thunderbird could crash during local message search

Replying could fail with mailnews.reply_quoting_selection.multi_word set false

Drag-drop of unselected contact inserted wrong or no email address

Changing identity in compose window caused modified draft not to be saved

Shift-click 'Compose Message To' on 'mailto' link did not open in plain text

Reply with selected text lost formatting for HTML messages containing </pre>

Multipart/related attachments were not preserved when editing or forwarding

Forwarded malformed MIME email had empty body and extra attachment

Message compose window was removed from Task Bar after saving as draft or template

Dragging email address between compose windows failed to add recipients

Thunderbird could crash when using Find and Replace All

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

Multiple saves while using 'Options' -> 'Send a Copy' resulted in multiple copies

Search for "Attachment" in Settings menu did not find "Files and Attachments"

Add-on account creation did not work with Account Hub

Owl install did not show link to website in Account Hub

Username field did not appear in Account Hub when exchange authentication failed

Account Hub advanced config setup did not include default outgoing config

Disabled inputs could be toggled in Account Hub address book

Users could not disable spinning overlay in Account Hub for email

Account Hub local address book creation could continue with blank name

Account Hub email success messages were not always accurate about config source

Calendar/address book sections were shown in Account Hub when there were none

New password-based Exchange accounts failed to save passwords in login manager

Account hub showed connection security instead of actual authentication method

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

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 autodetect wrongly prompted for a password when auth was unavailable

Interrupted external OAuth2 setup required restarting Thunderbird

The default account could be reset after restart if uninitialized

Virtual folders did not update correctly for filtered POP3 messages

'Copy Message to' action in a newsgroup filter did not work

Thunderbird could crash while importing mail thread

Thunderbird did not clearly fail when importing profile from a bad source

Thunderbird could not import profile located at the top level of zip file

'Any Number' was unavailable in address book search with 'Match all of the following'

Contact not found in Advanced Address Book Search if phone number had a period

Thunderbird did not display contact photos in WebP format from CardDAV servers

Opening a vCard (.vcf) from file manager or CLI did not work in some cases

Redirected CardDAV URLs resolved relative URLs against the wrong host

Installations from Microsoft Store did not open when clicking 'mailto:' links

Windows new message notification click did not bring Thunderbird to foreground

Microsoft Store installs did not open when clicking 'news://' link or .eml file

Using thunderbird -compose with double quotes made last email address invalid

Clicking the backspace icon in the quick filter field cleared the input field

Subfolder kept stale accessibility unread count after unread messages were deleted

Moving virtual folder within maildir based IMAP or local folder could fail

Thunderbird could crash when completing folder copy/move

'Edit as New Message' and inline 'Forward' not possible with PGP-signed messages

Various MIME improvements

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

Thunderbird could crash when marking all messages as read

Auto-compaction could corrupt database and cause crashes during syncs

'news:' URIs without specific server had incorrect format displayed in status bar

'Mark' -> 'All Read' affected newsgroup messages that had not been fetched yet

Thunderbird could not reconnect to newsgroups after connection loss until restarted

Sending a newsgroup post appeared successful when it had actually failed

Saving a new draft retained superceded version

Thunderbird hung when auto-checking multiple accounts for new messages

Spam not checked with mail.server.default.check_all_folders_for_new on

Startup could be slow with large number of folders not using subscriptions

Saved search in unified folder resulted in server error

Thunderbird did not report refused POP3 connection

Remove message body retention policy was not functional

POP3 could stop downloading mail until restart

With auto-mark-read disabled, large mail still marked as read during load delay

IMAP "Show only subscribed folders" could not be changed without restart

POP3 deadlocked when server went silent without closing socket

Thunderbird could crash when mail folder was renamed or moved

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

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

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

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

Enterprise policy use not indicated in about:preferences with link to about:policies

Language field in settings was empty after restart in Troubleshoot Mode

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

Archived RSS feed messages were sent to the archive folder of default identity

Broken feed icon could prevent updating of feeds

Task reminders could fail for tasks without end dates or with shifted due dates

Calendar did not alert user for connection issues

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

Could not copy an event in multiweek or month view by drag-and-drop

Duplicate attendees were added to invitations instead of being filtered out

Calendar discovery with certificate error displayed multiple exceptions

It was not possible to create date-only all-day tasks

Task percentage complete was not preserved separately from status in tooltips

Calendar invites were incorrectly marked processed after calendar sync completed

ICS event comments were not displayed in Thunderbird event details

Dismissed Gmail calendar reminder did nothing and item stayed visible

iCal imports misread unknown timezones as GMT, creating events at wrong times

Could not export local calendar as HTML

Cancelled filter edit dialog closed the message filter dialog

Visual and UX improvements