K-9 Mail

K-9 Mail Icon

K-9 (or Thunderbird for Android) is open source, very well supported and trusted - k9 has been around for nearly as long as Android itself! It supports multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures, BCC-self, PGP/MIME & more. Install OpenKeychain along side it, in order to encrypt/ decrypt emails using OpenPGP.

Open Source

K-9 Mail Privacy Policy

Privacy Policy Summary

  • You are not being tracked
  • Features of the website are made available under a free software license
  • The service is open-source




  • About
    Created 16 May 21, Last modified 3 years ago
  • Privacy Policy
    Created 16 May 21, Last modified 3 years ago

About the Data

This data is kindly provided by tosdr.org. Read full report at: #3624

K-9 Mail Source Code




K-9 Mail ‚Äď Open Source Email App for Android







04 Feb 11

Last Updated

08 Jun 24

Latest version


Primary Language



103,759 KB







Language Usage

Language Usage

Star History

Star History

Recent Commits

  • cketti (07 Jun 24)

    Merge pull request #7912 from thunderbird/add_corsican Add Corsican to supported languages

  • cketti (07 Jun 24)

    Merge pull request #7907 from thunderbird/fix_launcher_shortcuts Fix launcher shortcuts (attempt #2)

  • Wolf-Martell Montw√© (07 Jun 24)

    Merge pull request #7903 from thunderbird/add-string-resource-mover-cli-script Add String resource mover CLI script

  • Wolf-Martell Montw√© (04 Jun 24)

    Add String resource mover cli script

  • cketti (06 Jun 24)

    Add Corsican to supported languages

  • cketti (06 Jun 24)

    Merge pull request #7911 from weblate/weblate-tb-android-app-strings Translations update from Hosted Weblate

  • Hosted Weblate (06 Jun 24)

    Update translations (Weblate) Co-authored-by: AO Localisation Lab <[email protected]> Co-authored-by: AndyRn.t.me <[email protected]> Co-authored-by: Cyp <[email protected]> Co-authored-by: Hosted Weblate <[email protected]> Co-authored-by: Kazushi Hayama <[email protected]> Co-authored-by: Kuzmich55 <[email protected]> Co-authored-by: Languages add-on <[email protected]> Co-authored-by: M. Cosmin <[email protected]> Co-authored-by: Matthaiks <[email protected]> Co-authored-by: Michael Sharvit <[email protected]> Co-authored-by: Ońüuz Ersen <[email protected]> Co-authored-by: Patrick Santa Maria <[email protected]> Co-authored-by: Reza Zarchi <[email protected]> Co-authored-by: Sketch6580 <[email protected]> Co-authored-by: Stephan Paternotte <[email protected]> Co-authored-by: Taufik Adi Wicaksono <[email protected]> Co-authored-by: Wim Benes <[email protected]> Co-authored-by: gallegonovato <[email protected]> Co-authored-by: hugoalh <[email protected]> Co-authored-by: nautilusx <[email protected]> Co-authored-by: ngocanhtve <[email protected]> Co-authored-by: victor dargallo <[email protected]> Co-authored-by: winver <[email protected]> Translate-URL: https://hosted.weblate.org/projects/tb-android/account-common/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-oauth/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-oauth/ko/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-server-certificate/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-server-settings/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-server-settings/fa/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-server-settings/uk/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-server-validation/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-setup/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-setup/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/account-setup/ko/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/de/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/es/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/fa/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/fr/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/fy/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/he/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/id/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/it/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/ja/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/nl/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/pl/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/ro/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/ru/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/tr/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/vi/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-store-metadata-k9mail/zh_Hans/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-strings/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-strings/ca/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-strings/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-strings/zh_Hant/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-ui-base/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/app-ui-base/enm/ Translate-URL: https://hosted.weblate.org/projects/tb-android/designsystem/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/onboarding-permissions/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/onboarding-permissions/ko/ Translate-URL: https://hosted.weblate.org/projects/tb-android/onboarding/co/ Translate-URL: https://hosted.weblate.org/projects/tb-android/settings-import/co/ Translation: K-9 Mail/Thunderbird/App Store Metadata (K-9 Mail) Translation: K-9 Mail/Thunderbird/account-common Translation: K-9 Mail/Thunderbird/account-oauth Translation: K-9 Mail/Thunderbird/account-server-certificate Translation: K-9 Mail/Thunderbird/account-server-settings Translation: K-9 Mail/Thunderbird/account-server-validation Translation: K-9 Mail/Thunderbird/account-setup Translation: K-9 Mail/Thunderbird/app-ui-base Translation: K-9 Mail/Thunderbird/designsystem Translation: K-9 Mail/Thunderbird/onboarding-permissions Translation: K-9 Mail/Thunderbird/onboarding-welcome Translation: K-9 Mail/Thunderbird/settings-import Translation: K-9 Mail/Thunderbird/ui-legacy

  • Wolf-Martell Montw√© (04 Jun 24)

    Add ShortcutManagerCompat support Co-authored-by: cketti <[email protected]>

  • Wolf-Martell Montw√© (04 Jun 24)

    Merge pull request #7900 from thunderbird/add-material3-legacy-theme2 Add Material 3 legacy theme 2

  • Wolf-Martell Montw√© (03 Jun 24)

    Add app logo

  • Wolf-Martell Montw√© (31 May 24)

    Move Thunderbird icon to legacy theme and add monochrome icons

  • Wolf-Martell Montw√© (31 May 24)

    Move K9 app icon to legacy theme

  • Wolf-Martell Montw√© (31 May 24)

    Add legacy theme2 for Thunderbird

  • Wolf-Martell Montw√© (31 May 24)

    Remove `backgroundColorChooseAccountHeader` attribute

  • Wolf-Martell Montw√© (31 May 24)

    Change theme naming scheme to follow the default order

  • Wolf-Martell Montw√© (30 May 24)

    Add K-9 Mail legacy theme2

  • Wolf-Martell Montw√© (07 Mar 24)

    Add Material 3 common legacy theme2

  • cketti (04 Jun 24)

    Merge pull request #7899 from thunderbird/rename_internal_preferences_storage_classes Rename package/classes to not use plural names

  • Wolf-Martell Montw√© (03 Jun 24)

    Merge pull request #7898 from thunderbird/change-launcher-shortcuts-to-kotlin Change launcher shortcuts to kotlin

  • Wolf-Martell Montw√© (03 Jun 24)

    Move intent setup to result declaration

  • cketti (03 Jun 24)

    Rename `StorageMigrationsHelper` to `StorageMigrationHelper`

  • Wolf-Martell Montw√© (03 Jun 24)

    Merge pull request #7897 from thunderbird/cleanup-legacy-module Remove unused resources

  • cketti (03 Jun 24)

    Rename `com.fsck.k9.preferences.migrations` to `….migration`

  • cketti (03 Jun 24)

    Merge pull request #7891 from thunderbird/rewrite_server_settings Fix server settings where username or password contains line break

  • cketti (29 May 24)

    Strip line breaks from persisted server settings

  • Wolf-Martell Montw√© (03 Jun 24)

    Change LauncherShortcuts to Kotlin Signed-off-by: Wolf-Martell Montw√© <[email protected]>

  • Wolf-Martell Montw√© (03 Jun 24)

    Rename .java to .kt Signed-off-by: Wolf-Martell Montw√© <[email protected]>

  • Wolf-Martell Montw√© (03 Jun 24)

    Remove unused resources

  • Wolf-Martell Montw√© (30 May 24)

    Merge pull request #7887 from thunderbird/change-to-material-3-components-part1 Change to Material 3 components - part 1

  • Wolf-Martell Montw√© (29 May 24)

    Change TextView to MaterialTextView

K-9 Mail Website


K-9 Mail

K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email


Does not redirect

Security Checks

All 66 security checks passed

Server Details

  • IP Address
  • Hostname cdn-185-199-110-153.github.com
  • Location California, Pennsylvania, United States of America, NA
  • ISP GitHub Inc.
  • ASN AS54113

Associated Countries

  • CA
  • GB
  • DE
  • US

Saftey Score

Website marked as safe


Blacklist Check

k9mail.app was found on 0 blacklists

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Website Preview

K-9 Mail Android App

Update Info

  • App K-9 Mail
  • Creation Date 25 Jul 21
  • Last Updated 08 Dec 23
  • Current Version 5.800


No trackers found


  • Access Network State
  • Foreground Service
  • Internet
  • Read Contacts
  • Read Sync Settings
  • Receive Boot Completed
  • Vibrate
  • Wake Lock
  • Delete Messages
  • Read Messages

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About the Data: K-9 Mail


You can access K-9 Mail's data programmatically via our API. Simply make a GET request to:


The REST API is free, no-auth and CORS-enabled. To learn more, view the Swagger Docs or read the API Usage Guide.

About the Data

Beyond the user-submitted YAML you see above, we also augment each listing with additional data dynamically fetched from several sources. To learn more about where the rest of data included in this page comes from, and how it is computed, see the About the Data section of our About page.

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