Fixed:

• Crash occurred in 17.0b1 split view mode while in landscape

Contributors:

• Thanks to @rafaeltonholo

Full Changelog: THUNDERBIRD_17_0b1...THUNDERBIRD_17_0b2

New:

• Account avatar customization
• Foldable device support with split-screen
• Email messages can be printed
• Unified folder account indicator identifies message ownership
• Display account avatar in message notifications
• Improved email rendering enabled enabled for beta

Fixed:

• Deleted/read messages in unified inbox may not update until manual refresh
• Edge-to-edge regressions affected account setup screens
• Tap behavior was unreliable in recipient fields
• Incorrect icon was displayed for 'Find folder'
• Device orientation change duplicated recipient field text
• Copied link text incorrectly included CSS
• Unselecting 'Colorize contact pictures' setting did not persist
• Some general settings were not preserved after export and import

Contributors:

• @AaronDewes made their first contribution in #10316
• @farukgdev made their first contribution in #10353
• @javaman97 made their first contribution in #10369
• @someonesocial made their first contribution in #10358
• Thanks also to @dandarnell, @rafaeltonholo, @shamim-emon, @jan-lund, @wmontwe, @dani-zilla, @Goooler

Full Changelog: THUNDERBIRD_16_0b4...THUNDERBIRD_17_0b1

New:

• Default folder expansion behavior can be controlled by setting
• Preferred content type can be switched between text/plain and text/html

Fixed:

• Switching folders required an excessive number of clicks
• Fix various edge-to-edge issues
• Application crashed at startup
• Application crashed on Pixel 10 Pro when returning to message list
• OAuth SMTP authentication failed with some Microsoft servers

Unresolved:

• Deleted/read messages in unified inbox may not update until manual refresh

Contributors:

• @tenzap made their first contribution in #10037
• Thanks to @dandarnell, @wmontwe, @coreycb, @shamim-emon, @rafaeltonholo, @tenzap, @krzysdz

Full Changelog: THUNDERBIRD_15_0...THUNDERBIRD_16_0

New:

• Default folder expansion behavior can be controlled by setting
• Preferred content type can be switched between text/plain and text/html

Fixed:

• Switching folders required an excessive number of clicks
• Fix various edge-to-edge issues
• Application crashed at startup
• Application crashed on Pixel 10 Pro when returning to message list
• OAuth SMTP authentication failed with some Microsoft servers

Unresolved:

• Deleted/read messages in unified inbox may not update until manual refresh

Contributors:

• @tenzap made their first contribution in #10037
• Thanks to @dandarnell, @wmontwe, @coreycb, @shamim-emon, @rafaeltonholo, @tenzap, @krzysdz

Full Changelog: K9MAIL_15_0...K9MAIL_16_0

Fixed:

• OAuth SMTP authentication failed with some Microsoft servers

Contributors:

• Thanks to @rafaeltonholo

Full Changelog: THUNDERBIRD_16_0b3...THUNDERBIRD_16_0b4

Changed:

• Default sync interval has been changed from 60 minutes to 15 minutes
• Use application icon in push notification messages

Fixed:

• 'Colorize contact pictures' default changed unexpectedly from true to false
• Displaying IMAP password in plain text did not prompt for authentication
• Sync debug logger did not write any logs

Contributors:

• @thgoebel made their first contribution in #9820
• @IsakTheHacker made their first contribution in #10075
• Thanks also to @shamim-emon, @coreycb, @rafaeltonholo, @wmontwe, @kewisch, @Goooler, @SttApollo, @liutikas

Full Changelog: THUNDERBIRD_14_0...THUNDERBIRD_15_0

Changed:

• Default sync interval has been changed from 60 minutes to 15 minutes
• Use application icon in push notification messages

Fixed:

• 'Colorize contact pictures' default changed unexpectedly from true to false
• Displaying IMAP password in plain text did not prompt for authentication
• Sync debug logger did not write any logs

Contributors:

• @thgoebel made their first contribution in #9820
• @IsakTheHacker made their first contribution in #10075
• Thanks also to @shamim-emon, @coreycb, @rafaeltonholo, @wmontwe, @kewisch, @Goooler, @SttApollo, @liutikas

Full Changelog: K9MAIL_14_0...K9MAIL_15_0

Fixed:

• Application crashed on Pixel 10 Pro when returning to message list
• Account avatar monograms reverted to initial account name and could not be renamed

Contributors:

• Thanks to @wmontwe

Full Changelog: THUNDERBIRD_16_0b2...THUNDERBIRD_16_0b3

Fixed:

• Application crashed at startup
• Fix various edge-to-edge issues throughout the app

Contributors:

• Thanks to @wmontwe

Full Changelog: THUNDERBIRD_16_0b1...THUNDERBIRD_16_0b2

New:

• Enable Memory Tagging Extension on MTE-capable devices to improve memory safety
• Add setting to control default folder expansion behavior
• Add the ability to switch between text/plain and text/html display

Fixed:

• Switching folders required an excessive number of clicks
• Fix various edge-to-edge issues throughout the app

Contributors:

• @tenzap made their first contribution in #10037
• Thanks also to @wmontwe, @coreycb, @shamim-emon, @rafaeltonholo, @tenzap, @liutikas, @krzysdz

Full Changelog: THUNDERBIRD_15_0b1...THUNDERBIRD_16_0b1