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K-9 Mail icon

K-9 Mail 23.1 APK download

Old versions may contain security vulnerabilities. Prefer the latest version when possible.

Version
23.1
Released
Sep 25, 2026
Minimum Android
Android 6
Target Android
Android 16
Package
com.fsck.k9

Download

Download 10.3 MB
SHA-256: a9a6d4219fe44bfb4e47693efa973c0c173741074193d8e9d7e37a354e7aafca

This build will not install over a Google Play version of the same app. Uninstall the existing app first (back up your data).

How to install an APK file on Android · Which APK should I download? arm64-v8a, armeabi-v7a and x86 explained · How to check an APK's SHA-256 checksum

Screenshots

K-9 Mail 23.1 screenshot 1 K-9 Mail 23.1 screenshot 2 K-9 Mail 23.1 screenshot 3 K-9 Mail 23.1 screenshot 4 K-9 Mail 23.1 screenshot 5 K-9 Mail 23.1 screenshot 6 K-9 Mail 23.1 screenshot 7

What's new

K-9 Mail version 23.1

Fixed:
• Attachment filenames with non-ASCII characters were incorrectly decoded and saved

Permissions

No permission changes compared to the previous version.

All permissions (16)
  • 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.fsck.k9.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

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