K-9 Mail

Name: K-9 Mail
Availability: InStock
Rating: 3.4600000381469727 (99604 reviews)
Author: Mozilla Thunderbird

Mozilla Thunderbird

In-app purchases

3.5

99.6K 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 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

3.5

94.4K reviews

Johannes Garz

January 8, 2025

Free and open source, but still comes with a great design. Also has push notifications, swipe actions, folder customization and a dark theme. I never had any issues with the synchronization of 6 different accounts (Gmail & self-hosted). Only thing I'm missing is the option to customize the quick actions on a notification, I'd like to be able to archive a mail right from there.

3 people found this review helpful

Marco Johns

January 11, 2025

I just realized that K9 mail does not store sent e-mails into the sent folder. They simply disappear completely without any trace. Apparently you have to set the folders manually for each mail account in the app. Because for some reason the automatic/default setting is "Automatic (none)" instead of just creating folders or mapping to existing folders with the same name - or at least *ASKING* the user.

1 person found this review helpful

Mozilla Thunderbird

January 14, 2025

Thanks for your review and feedback, and we're sorry for any frustration with the default settings. You can propose changes to the current defaults at our official feedback site: https://connect.mozilla.org/t5/forums/postpage/board-id/ideas - there, the rest of the community can upvote and comment on changes they'd like us to prioritize!

Lisa C

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.

11 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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