K-9 Mail Icon

K-9 Mail 13.0

By Mozilla Thunderbird • February 24, 2026
Communication arm64-v8a, armeabi-v7a, x86, x86_64 Native (Java/Kotlin) 12.34 MB
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File Information

Package Namecom.fsck.k9
Version Name13.0
Version Code39029
Architecturearm64-v8a, armeabi-v7a, x86, x86_64
Min Android VersionAndroid 21 (API 35)
Main Activitycom.fsck.k9.activity.MessageList
FrameworkNative (Java/Kotlin)
File Size12.34 MB
Signature (SHA1)0F1F3252CBA1C94DDD6186DAD5A035E96C6EE5E3
File Hash (SHA256)159406d0c9364bc0d93b531987e09137fe2be49155f031f42af96809b0d210e8

What's New

- Selected/read/unread message states were hard to distinguish visually

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 at

forum.k9mail.app

Want to help?

K-9 Mail is now part of the Thunderbird family and remains 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

github.com/thunderbird/thunderbird-android

We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
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APK Permissions 17

  • android.permission.ACCESS_NETWORK_STATE
  • android.permission.CAMERA
  • 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.android.vending.BILLING
  • 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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