K-9 Mail

Name: K-9 Mail
Availability: InStock
Rating: 3.3768997192382812 (99705 reviews)
Author: Mozilla Thunderbird

Mozilla Thunderbird

In-app purchases

3.4

99.7K reviews

5M+

Downloads

Everyone

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

3.3

94.5K reviews

Susan Powell

March 13, 2025

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.

10 people found this review helpful

Lisa

January 7, 2025

(Jan 2025) Checking these reviews, I will not update the app at this time because I don't want to mess it up! So often updates wreck a perfectly good app. UPDATE#2 I had to redo my email credentials because it stopped receiving emails. It seems fine now. I use this for only Startmail. I am avoiding updating the app itself, I don't know why it loses the credentials, it goes a very long time without a glitch so maybe the issue is on Startmail's end, but I am happy it works now.

30 people found this review helpful

Dan Gilliam

November 5, 2024

No. Just, no. It went from 5 stars to 1 in one version. The new interface is clunky and cumbersome, and unintuitive. The old interface was perfect, especially if you have multiple accounts. Please bring it back, make a legacy version, something. I am one inch away from going to another app and chalking this into the "Used to be amazing" list.

72 people 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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