K-9 Mail

Name: K-9 Mail
Availability: InStock
Rating: 3.366366386413574 (99683 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

Dec 9, 2024

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

3.4

94.5K reviews

Thomas Romanov

February 26, 2025

Absolutely terrible new interface! It was the best email app for multiple accounts, now I have to find something else because I cannot use it after this last update. The interface is horrible. I cannot see the account names listed instead a stupid icon with two letters and I have to perform multiple clicks to see the content of each inbox after I decipher the name. Im looking for a new email app now.

4 people found this review helpful

Mozilla Thunderbird

February 27, 2025

We're so sorry for any frustration with the new account drawer, and making it more intuitive and easy to use again is one of our highest priorities. You can follow our development updates at blog.thunderbird.net and see improvements as they land by helping test the Thunderbird Beta.

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.

21 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.

61 people found this review helpful

What’s new

- You can now support K-9 Mail development with financial contributions.
- Account initials now use the display name
- Account icons remain in the same position when selected
- Help text linking to support page added for Gmail login issues
- Unified inbox enabled only when multiple accounts are configured
- Push service now starts reliably when expected
- Correct default delete message action for QR-imported accounts.
- Folder drawer updates properly on account configuration changes

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