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K-9 Mail – Advanced Email for Android
Latest commit 9e01238 @cketti cketti Merge pull request #853
Update project URL in welcome message
Failed to load latest commit information.
.tx Update Transifex client configuration
config Ignore Lint warning for OldTargetApi
docs Remove outdated docs
gradle Improve FindBugs Gradle task
images Work on new pgp header
k9mail-library Merge pull request #829 from k9mail/auto_detect_archive_folder
k9mail Update the project url, which is contained in the welcome message and…
plugins Update OpenPGP API to v8, use jcenter dependency, remove sub-project
tools Use https to download SDK
.gitattributes Force gradlew (and other shell scripts) to use lf line endings.
.gitignore Remove old IntelliJ project files
.gitmodules Kill our use of submodules dead. They're too painful for new contribu… Add first version of guidelines for contributing
HTMLCLEANER_LICENSE Merge ashleywillis' changes in #97.
NOTICE Initial commit - This source code should be EXACTLY what the current … Update README
build.gradle Update Gradle Android plugin to 1.2.3
gradlew Add Gradle wrapper
gradlew.bat Add Gradle wrapper Add first version of guidelines for contributing
proguard.cfg Remove ActionBarSherlock
settings.gradle Update OpenPGP API to v8, use jcenter dependency, remove sub-project

K-9 Mail

Build Status Join the chat

K-9 Mail is an open-source email client for Android.


K-9 Mail can be downloaded from a couple of sources:

You might also be interested in becoming a beta tester or an alpha tester to get an early look at new versions.

Release Notes

Check out the Release Notes to find out what changed in each version of K-9 Mail.

Need Help?

If the app is not behaving like it should, you might find these resources helpful:


Interested in helping to translate K-9 Mail? Contribute here:


Please fork this repository and contribute back using pull requests.

Any contributions, large or small, major features, bug fixes, unit/integration tests are welcomed and appreciated but will be thoroughly reviewed and discussed. Please make sure you read the Code Style Guidelines.


Aside from discussing changes in pull requests and issues we use the following communication services:


Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
See the License for the specific language governing permissions and
limitations under the License.


CloudBees' FOSS program allows us to use their DEV@cloud service for free.

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