Full-featured email client

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Antivirus & safety scan results

Scan Date: Oct 22, 2026 Software Version: 24.0

Status: ✅ Trusted & Safe to install This app is signed by thundernest with trusted and verified digital signature and it will updated existing K-9 Mail installations Certificate fingerprint: a8240c05184d797c87efed01d907961f8b4ad62b Issuer: C:UK, CN:FDroid, L:ORG, O:fdroid.org, ST:ORG, OU:FDroid How we verify APK files security

Android antivirus Status

K7GW Clean ✅

DrWeb Clean ✅

VirIT Clean ✅

ClamAV Clean ✅

Google Clean ✅

Ikarus Clean ✅

Lionic Clean ✅

Sophos Clean ✅

Yandex Clean ✅

Alibaba Clean ✅

Tencent Clean ✅

Xcitium Clean ✅

Fortinet Clean ✅

Kingsoft Clean ✅

Symantec Clean ✅

AhnLab-V3 Clean ✅

Kaspersky Clean ✅

Microsoft Clean ✅

Trustlook Clean ✅

ESET-NOD32 Clean ✅

Avast-Mobile Clean ✅

NANO-Antivirus Clean ✅

BitDefenderFalx Clean ✅

K-9 Mail Email app 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 youre having trouble with K-9 Mail, ask for help in our support forum.

Want to help?

K-9 Mail is a community developed project. If youre interested in helping to improve the app, please join us! You can find our bug tracker, source code, and wiki at https://github.com/thundernest/k-9. Were always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.

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Screenshots & Video

Specifications

Package Name	com.fsck.k9
Requirements	Android 5.0 (Lollipop API 21)
Author	thundernest
APK Size	10.4 MB
Categories	Communication, Email
Source Code	https://github.com/thundernest/k-9