K-9 Mail
com.fsck.k9
FreeIn-app purchasesEveryone
The rest of Mozilla Thunderbird's catalogue
Key numbers
5M+Installs
3.0 / 1KRating
—Released
Oct 6, 2026Updated
About the app
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 you…
Listing details
| Package name | com.fsck.k9 |
|---|---|
| Developer | Mozilla Thunderbird |
| Developer website | k9mail.app |
| Category | Communication |
| Installs (exact) | 9,532,528 |
| Ratings | 99,716 |
| Reviews | 11,062 |
| Price | Free |
| In-app purchases | $5.00 - $200.00 per item |
| Ads | No |
| Content rating | Everyone |
| Current version | 24.0 |
| Requires Android | 6.0 |
| Last update | Oct 6, 2026 |
| Record refreshed | Oct 27, 2026 |