K-9 Mail Apk

K-9 Mail Apk

Latest version 9.0
23 Mar 2025

Older Versions

Apk Infos

Version9.0
Rating3.4/5, based on 99,721 votes
Size‎10.1 MB
Requires AndroidAndroid 5.0+ (Lollipop)
Author's NotesK-9 Mail is a 100% open source, privacy focused email client for Android

About K-9 Mail APK

K-9 Mail APK Download for Android
K-9 Mail APK Download for Android

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 https://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 https://github.com/thunderbird/thunderbird-android
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

Latest updates

What's new in version 9.0

- Basic support for Android 15
- Add a link to the support article when signing in with Google
- Account setup attempts email provider's autoconfig first, then falls back to ISPDB
- Updated translations for multiple languages
- The changelog now properly displays release versions
- A wrong translation of the app name has been fixed
- Dependencies have been updated to fix a couple of bugs

How to install K-9 Mail APK on Android phone or tablet?

Download K-9 Mail APK file from ApkClean, then follow these steps:

Update Phone Settings

  • Go to your phone Settings page
  • Tap Security or Applications (varies with device)
  • Check the Unknown Sources box
  • Confirm with OK

Go to Downloads

  • Open Downloads on your device by going to My Files or Files
  • Tap the APK file you downloaded (com.fsck.k9-v9.0-ApkClean.apk)
  • Tap Install when prompted, the APK file you downloaded will be installed on your device.

Older Versions

9.0 (39022)10.1 MB
8.2 (39019)10.7 MB
8.1 (39012)10.1 MB

Questions & Answers

Q: What is an APK File?

A: Just like Windows (PC) systems use an .exe file for installing software, Android does the same. An APK file is the file format used for installing software on the Android operating system.

Q: If I install an APK from this website, will I be able to update the app from the Play Store?

A: Yes, absolutely. The Play Store installs APKs it downloads from Google's servers, and sideloading from a site like ApkClean.net goes through a very similar process, except you're the one performing the downloading and initiating the installation (sideloading).
As soon as the Play Store finds a version of the app newer than the one you've sideloaded, it will commence an update.

Q: Why ApkClean.net can guarantee APK 100% safe?

A: Whenever someone wants to download an APK file from ApkClean.net, we'll check the corresponding APK file on Google Play and allow user download it directly (of course, we'll cache it on our server). If the APK file does not exist on Google Play, we'll search it in our cache.

Q: What are Android App permissions?

A: Apps require access to certain systems within your device. When you install an application, you are notified of all of the permissions required to run that application.

Don't hesitate to contact us if you have any questions or concerns.

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User's Reivew

1 ★Sent email often stuck in Outbox, making miscommunication. Pretty bad user experience.
1 ★UI is stupid, app loses account settings regularly, mail doesn't always leave as it should. This is not a reliable application.
5 ★Works very well, love that its open-source and has no ads or other nonsense.
5 ★excellent mail client! easy to set up, very clean interface
5 ★Excellent
5 ★A Hidden Gem for PGP-Encrypted Email! K-9 Mail is an outstanding open-source email app, and its seamless integration with OpenKeychain makes it a must-have for anyone looking to send encrypted emails effortlessly. If you're searching for an easy way to create and use PGP encryption, this app makes it incredibly simple—just pull in your key from OpenKeychain and start sending secure emails right away. No complicated setup, no headaches—just secure, private communication made easy.
1 ★doesn't seem to be working with Gmail any longer.
2 ★v6.904 has the good UI. The new UI is garbage. But I guess that's expected when the man sold out :(. I cannot recommend this app anymore apart from the old version.
1 ★App routinely moves sent emails to outbox folder where they sit sometimes for days and never leave. Incoming emails show up delayed. This started after last update
5 ★K-9 Mail v9.0 Been using this app for years and it's always provided the services I require and generally been very stable.