Phone

K-9 Mail

Communication • Mozilla Thunderbird • ⭐ 3.28 • 5,000,000+

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

Version 6.803 9.7 MB

Screenshots

No screenshots available yet.

Permissions Explained 13 permissions requested View details

This app requests 13 permissions. The table below explains what each permission may allow and what users should review before installing.

Status	Permission	What it means	Why it may be used	User safety note
⚠️ Sensitive	Read contacts android.permission.READ_CONTACTS	Allows the app to read contacts stored on the device.	Used for messaging, calling, social features, contact sync, invitations, or account matching.	Sensitive permission. Review carefully if the app does not need contact-related features.
ℹ️ Review	Send notifications android.permission.POST_NOTIFICATIONS	Allows the app to send notifications to the device.	Used for alerts, reminders, messages, account activity, updates, or media controls.	Review notification settings if the app sends too many alerts.
ℹ️ Review	Receive Boot Completed android.permission.RECEIVE_BOOT_COMPLETED	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
ℹ️ Review	Read Sync Settings android.permission.READ_SYNC_SETTINGS	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
✅ Common	View network status android.permission.ACCESS_NETWORK_STATE	Allows the app to check whether the device is connected to Wi-Fi, mobile data, or another network.	Often used to avoid loading content when offline or to adjust loading based on connection quality.	Generally low risk by itself.
✅ Common	Internet access android.permission.INTERNET	Allows the app to open network connections and communicate with online services.	Commonly used for streaming, syncing, login, ads, analytics, downloads, cloud features, and app updates.	Common permission. Review the app’s behavior if it does not appear to need online access.
✅ Common	Vibration control android.permission.VIBRATE	Allows the app to control device vibration.	Used for notifications, alerts, haptic feedback, timers, alarms, or game feedback.	Generally low risk by itself.
ℹ️ Review	Keep device awake android.permission.WAKE_LOCK	Allows the app to prevent the device from sleeping while a task is running.	Used for media playback, downloads, navigation, alarms, calls, or long-running background tasks.	Review battery usage if the app keeps the device awake too often.
ℹ️ Review	Foreground Service android.permission.FOREGROUND_SERVICE	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
ℹ️ Review	Schedule Exact Alarm android.permission.SCHEDULE_EXACT_ALARM	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
ℹ️ Review	Use Biometric android.permission.USE_BIOMETRIC	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
ℹ️ Review	Use Fingerprint android.permission.USE_FINGERPRINT	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.
ℹ️ Review	Com Fsck K9 Dynamic Receiver Not Exported Permission com.fsck.k9.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION	This is an Android permission or app-specific permission requested by the app.	The app may use this permission for features related to its category, device support, background behavior, storage, connectivity, or system integration.	Review this permission before installing, especially if it does not match the app’s expected purpose.

About K-9 Mail

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

What K-9 Mail Is Used For

K-9 Mail appears to be an Android email client for managing personal or work inboxes on a phone. Based on the metadata, it is designed for communication tasks such as sending and receiving email, checking multiple accounts, and keeping messages organized in one app. Its open-source, privacy-focused positioning suggests it may appeal to users who want a more control-oriented mail experience than a default inbox app.

The listed permissions fit common email-app functions. Internet access and network state are needed for syncing mail, while contacts access may help when composing messages or auto-filling recipients. Notification, wake lock, boot, and foreground service permissions suggest it may support background mail checking and timely alerts for new messages. Biometric and fingerprint permissions indicate the app may also support locking or opening mail with device authentication, which can be useful for sensitive inboxes. Based on the category and app type, this is mainly a phone app for everyday email use rather than a media or entertainment tool.

Common uses

Read and send email from one or more accounts
Receive new message alerts and background sync updates
Manage inboxes on an Android phone
Use contacts when addressing messages
Access mail securely with biometric or fingerprint login
Keep email handling separate from a broader productivity suite
Useful for users who prefer an open-source mail client

Best for:

Email on phone Privacy-minded users Multiple inboxes Secure sign-in Open-source app

Related tags

App Details

Package:
com.fsck.k9

Category:
Communication

Developer:
Mozilla Thunderbird

Version:
6.803

Contains Ads:
No

In-App Purchases:
No

Official Listing

Package name: com.fsck.k9

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How to Download K-9 Mail

If this app is not hosted directly on APKApps official link, then for the safest and most up-to-date version, install it from its official Google Play listing.