K-9 Mail

Name: K-9 Mail
Availability: InStock
Rating: 3.6589596271514893 (99788 reviews)
Author: Mozilla Thunderbird

Mozilla Thunderbird

In-app purchases

3.7

99.8K reviews

5M+

Downloads

PEGI 3

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.

Updated on

Mar 10, 2025

Data safety

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 can’t be deleted

Ratings and reviews

3.7

94.6K reviews

Susan Powell

May 6, 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.

32 people found this review helpful

Mozilla Thunderbird

May 8, 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!

Geobear Nine

April 8, 2025

I finally got a newer phone that will no longer support good old version 5.60, which was a perfect 5 star email app, and I was forced to install 9.0. I REALLY miss having the app's primary screen be the list of accounts. I wish there were a setting that would allow me to bring that back. The current screen with the list of the current account's folders and list of accounts to the side would be ok. I loved that summary as my intro & exit view. Minus 2 stars for that glaring omission.

7 people found this review helpful

Scott Sherman

April 22, 2025

Like the app plenty compared to Aquail which I was using preciously. Biggest improvement from the switch-over is that there's no ads that ruin the UX. Please update so that I can swipe to instantly delete instead of select/mark as read. Keep the tap icon for select though, that's good.

1 person found this review helpful

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

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