K-9 Mail

Developer: Mozilla Thunderbird

Category: Communication

9.4M installs

100K ratings

+4.3K weekly installs

trend steady

+18.6K monthly installs

SDKs, Trackers & Permissions

K-9 Mail was last scanned for SDKs 2025-09-22. Below is the overview of third party companies detected in the app. The full list of raw SDKs, app permissions and unknown SDKs is available here.

4 Development Tools

1 Business Tools

App Details

Store ID: com.fsck.k9

First Released:

Store Last Updated: 2025-09-03

In-App Purchases: Yes

Ads: No

Website: k9mail.app

App Store

Crawl Status: Success

Store First Crawled: 2021-02-06

Store Last Crawled: 2025-10-07

Ads & App-Ads.txt

App does not have ads.

SDK Tracking Status

Successful Last Crawled: 2025-09-22

Last Crawled: 2025-09-22

Last Crawl Status: Success

3.3★

Ratings: 100010

5★

4★

3★

2★

1★

Screenshots

App Description

K-9 Mail is a 100% open source, privacy focused email client for Android

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.