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Release Tue, Jun 23, 2026 1 min read

Thunderbird for Android K-9 Mail 20.0

Enable easily discoverable way to configure and use Thundermail ( 11086)

New:

  • Enable easily discoverable way to configure and use Thundermail (#11086)

Changed:

  • Only show message notification configuration actions above the cutoff (#10301)

Fixed:

  • Account drawer stayed open after account switch despite auto-select Inbox setting (#10120)
  • Imported settings could incorrectly show 'XX' avatar monogram (#10958)
  • Printed emails omitted message headers and used minimal margins (#10567)
  • Compose button did not work in tablet split-screen message view (#10753)
  • Accented subfolder names sorted to bottom instead of locale order (#10718)
  • Disabled font size setting appeared in General Settings search (#10756)
  • New mail notifications showed avatars when contact pictures were disabled (#10750)
  • Mail opening still used fade-in after animations were disabled (#1903)
  • Sidebar account-switching animations were too fast (#10480)

Contributors:

Thanks to: @Alecaddd, @coreycb, @dandarnell, @dani-zilla, @frabera, @harshad1, @jasi381, @jim-daf, @jondaley, @kryoseu, @mohitsatr, @mvanhorn, @numericOverflow, @rafaeltonholo, @saisafe, @shamim-emon, @stephenking314, @untitaker, @varshilsoni, @winne42, @wmontwe

New Contributors:

  • @Alecaddd made their first contribution in #10793
  • @jondaley made their first contribution in #10862
  • @saisafe made their first contribution in #10932
  • @kryoseu made their first contribution in #10997
  • @jim-daf made their first contribution in #11030
  • @numericOverflow made their first contribution in #11032
  • @varshilsoni made their first contribution in #11081

Full Changelog: https://github.com/thunderbird/thunderbird-android/compare/K9MAIL_19_2...K9MAIL_20_0