K-9 Mail
In-app purchases
3.7star
99.8K reviews
5M+
Downloads
Rated for 3+
info
About this app
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.
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.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Data is encrypted in transit
Data canāt be deleted
Ratings and reviews
3.8
94.6K reviews
Pavel Goloviy
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18 December 2023
Very good professionally made mail application! Good minimalist and convenient UI, love the vibes of Mozilla Thunderbird. Works flawlessly with my two email accounts. I do miss PIN code lock feature when you have to enter code after launching the application. I had several occasions when I had to pass over my unlocked phone to another person for a short while and my email is a sensitive content that I would like to have extra privacy protection for.
11 people found this review helpful
Dmytro āsan616mofoā Hoisan
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15 May 2025
1. Please improve the UI of the "Initial Identity" menu ā it looks incomplete and abandoned. 2. Allow renaming folders. For example, I donāt want ā[Gmail]/All Mailā ā just āAll Mailā. 3. Regarding initials: donāt auto-select the first two letters. Let users choose which two characters to display, especially when multiple emails have similar names. 4. It would be great to upload a custom avatar instead of showing initials.
1 person found this review helpful
Mozilla Thunderbird
16 May 2025
Thank you for your review and honest feedback, and many of these changes will be coming in the near future, especially for improving Google folders and more options to customize account icons, including images. You can follow our development updates at blog.thunderbird.net to learn when these will land!
Susan Powell
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- Show review history
6 May 2025
Update: K-9 just pushed ~100 old messages to the top. Sadly got one foot out the door. // I've used and appreciated K-9 for many years. A request:In v 8.2 it pushes to the top of my in-box messages that it thinks I need to follow up on. Please provide a way to disable this function! It's confusing because the messages are not marked to differentiate then from new ones and irritating because I generally disagree with the algorithm on what needs my attention. Thanks for considering.
34 people found this review helpful
Mozilla Thunderbird
8 May 2025
We're so sorry this happened, and you can set your preferences for what messages get synced (how many and how old) in Settings > [account] > Fetching Mail. If this doesn't fix the issue, we'd like to know more and help understand what's happening. Please open a support question at forum.k9mail.com so our support crew can help troubleshoot this!
What's new
- Basic support for Android 15
- Add a link to the support article when signing in with Google
- Account setup attempts email provider's autoconfig first, then falls back to ISPDB
- Updated translations for multiple languages
- The changelog now properly displays release versions
- A wrong translation of the app name has been fixed
- Dependencies have been updated to fix a couple of bugs
- Add a link to the support article when signing in with Google
- Account setup attempts email provider's autoconfig first, then falls back to ISPDB
- Updated translations for multiple languages
- The changelog now properly displays release versions
- A wrong translation of the app name has been fixed
- Dependencies have been updated to fix a couple of bugs
App support
About the developer
MZLA TECHNOLOGIES CORPORATION
mobile-appstore-admin@thunderbird.net
149 New Montgomery St Fl 4
San Francisco, CA 94105
United States
+1 650-910-8704
