K-9 Mail

Name: K-9 Mail
Availability: InStock
Rating: 3.855855941772461 (99831 reviews)
Author: Mozilla Thunderbird

Mozilla Thunderbird

In-app purchases

3.9

99.8K reviews

50L+

Downloads

Rated for 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

8 May 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

3.9

94.6K reviews

Pavel Goloviy

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

31 May 2025

New user. So far good experience. Everything looks and functions well. Look forward to utilizing the email. Do not see a way to log out of the app. When composing an email the recipient's address was hidden now it shows up. Do not know how to change. It is synced to use with another email provider only shows their information.

2 people found this review helpful

Dmytro “san616mofo” Hoisan

15 May 2025

1. Please improve the UI of the "Initial Identity" menu – it looks incomplete and abandoned. 2. Allow renaming folders. For example, I don’t want “[Gmail]/All Mail” — just “All Mail”. 3. Regarding initials: don’t 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.

3 people 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!

What's new

- Server field pre-filled in manual account setup
- Add a menu entry to empty the Spam folder
- Update Gmail OAuth client IDs to Thunderbird for Android
- Preserve the <s> tag when sanitizing HTML content
- Messages and star counts in the drawer update instantly
- Hide accounts setting now remembered across restarts
- Restart PushService after app update

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