K-9 Mail
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About this app
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K-9 Mail is a communication app by Mozilla Thunderbird; at 5,000,000+ installs it is with a solid seven-figure install base. Ratings sit around 3.3 out of 5 without a strong skew. The most recent release landed a few months back.
Free to download, though in-app purchases run €5.50 - €225.00 if billed through Play. Content is rated USK: All ages. It needs Android 6.0 or newer. 7,991 people have left a written review.
Rating distribution
Previous APK Versions All 36 ›
APK · 10.7 MB2026-08-14 K-9 Mail 21.1
APK · 10.7 MB2026-08-05 K-9 Mail 21.0
APK · 10.7 MB2026-07-21 K-9 Mail 20.1
APK · 10.6 MB2026-07-08 K-9 Mail 20.0
APK · 10.6 MB2026-06-25 K-9 Mail 19.2
APK · 10.6 MB2026-06-05 K-9 Mail 19.0
APK · 10.1 MB2026-05-29 K-9 Mail 18.0
APK · 9.9 MB2026-04-16 K-9 Mail 17.0
APK · 14.0 MB2026-03-19 K-9 Mail 16.1
APK · 13.4 MB2026-02-10
Frequently asked questions
01 Is K-9 Mail free?
Yes. K-9 Mail is listed as free on Google Play and offers in-app purchases (€5.50 - €225.00 if billed through Play).
02 Which Android version does K-9 Mail need?
The current release requires Android 6.0. If your device is older, one of the 36 earlier versions listed above may still install.
03 How do I install the APK?
Download the file from the version page, open it on your Android device and allow installs from this source when prompted. XAPK bundles need the APKPure app or a split-APK installer (see the install guide in the footer). Always prefer the latest version unless you specifically need an older build.
04 Is the download safe?
Files are served by an established third-party mirror and are the same builds distributed to Play Store users; APK Apex never repackages or modifies them. Check the developer name (Mozilla Thunderbird) and package name (com.fsck.k9) match what you expect.
