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Download K-9 Mail APK 10.0 arm64-v8a, armeabi-v7a, x86, x86_64 · Android 21+

By Mozilla Thunderbird • Updated August 29, 2026
Communication arm64-v8a, armeabi-v7a, x86, x86_64 Native (Java/Kotlin) 10.22 MB
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This is the arm64-v8a, armeabi-v7a, x86, x86_64 build of K-9 Mail 10.0. Pick this build if your device's primary ABI matches.

File size: 10.2 MB   •   Min Android: 21   •   Target Android: 34   •   Version code: 39023   •   Framework: Native (Java/Kotlin)   •   Permissions: 15

Screenshots

File Information

Package Namecom.fsck.k9
Version Name10.0
Version Code39023
Architecturearm64-v8a, armeabi-v7a, x86, x86_64
Min Android VersionAndroid 21 (API 34)
Main Activitycom.fsck.k9.activity.MessageList
FrameworkNative (Java/Kotlin)
File Size10.22 MB
Signature (SHA1)A8240C05184D797C87EFED01D907961F8B4AD62B
File Hash (SHA256)3ccb3d220d09648c3e7b1762610ee2d3bbc7490d59cf97994722b630b5f20052

What's New

New in version 10.0
- Server field pre-filled in manual account setup
- Add a menu entry to empty the Spam folder
- Update Gmail OAuth client IDs to Thunderbird for Android
- Preserve the tag when sanitizing HTML content
- Messages and star counts in the drawer update instantly
- Hide accounts setting now remembered across restarts
- Restart PushService after app update

App Description

K-9 Mail is an open source email client that works with basically every email provider.

Features

* Supports multiple accounts

* Unified Inbox

* Privacy-friendly (no tracking whatsoever, only connects to your email provider)

* Automatic background synchronization or push notifications

* Local and server-side search

* OpenPGP email encryption (PGP/MIME)

Install the app

OpenKeychain: Easy PGP

to encrypt/decrypt your emails using OpenPGP.

Support

If you're having trouble with K-9 Mail, ask for help in our

support forum

.

Want to help?

K-9 Mail is a community developed project. If you're interested in helping to improve the app, please join us!

You can find our bug tracker, source code, and wiki at

https://github.com/thunderbird/thunderbird-android

.

We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

License:

Apache License 2.0

Website

Issue Tracker

Translation

Source Code

Changelog

Build Metadata

Reproducibility Status
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APK Permissions 15

  • android.permission.ACCESS_NETWORK_STATE
  • android.permission.FOREGROUND_SERVICE
  • android.permission.FOREGROUND_SERVICE_DATA_SYNC
  • android.permission.FOREGROUND_SERVICE_SPECIAL_USE
  • android.permission.INTERNET
  • android.permission.POST_NOTIFICATIONS
  • android.permission.READ_CONTACTS
  • android.permission.READ_SYNC_SETTINGS
  • android.permission.RECEIVE_BOOT_COMPLETED
  • android.permission.SCHEDULE_EXACT_ALARM
  • android.permission.USE_BIOMETRIC
  • android.permission.USE_FINGERPRINT
  • android.permission.VIBRATE
  • android.permission.WAKE_LOCK
  • com.fsck.k9.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
APK Verified

The cryptographic signature guarantees that the file is safe to install and was not tampered with in any way.

Developer

Name: Mozilla Thunderbird

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Frequently Asked Questions about K-9 Mail APK

This variant is built for devices that report `arm64-v8a, armeabi-v7a, x86, x86_64` as their primary ABI. If your device's CPU matches, this is the smallest, fastest version to install.

Yes — the APK's signature has been cryptographically verified against the publisher's signing key. The SHA-256 hash is shown in the File Information panel so you can independently confirm the file matches the original release.

Android 21 (API level 34) or newer. Older devices will refuse the install.

Install a free app like 'CPU-Z' or 'Droid Hardware Info' from the Play Store and look at the ABI / Instruction Set row. Most phones made after 2017 are arm64-v8a; if in doubt, download the universal variant.

All variants are functionally identical — same features, same version. They differ only in which CPU architectures the native code is compiled for, and (sometimes) which screen densities the included graphics target. Pick the one that matches your device for the smallest install size, or pick 'Universal' if you're unsure.