K-9 Mail
Mozilla Thunderbird
3.2 ★
100K ratings
5,000,000+
downloads
Free
+ in-app
With this email client, you can manage multiple accounts, read messages, and use encryption features. Includes support for OpenPGP encryption, background synchronization, and a unified inbox.
AppRecs review analysis
AppRecs rating 3.1. Trustworthiness 88 out of 100. Review manipulation risk 19 out of 100. Based on a review sample analyzed.
★★★☆☆
3.1
AppRecs Rating
Ratings breakdown
5 star
36%
4 star
13%
3 star
11%
2 star
11%
1 star
29%
What to know
✓
Low review manipulation risk
19% review manipulation risk
✓
Credible reviews
88% trustworthiness score from analyzed reviews
⚠
High negative review ratio
40% of sampled ratings are 1–2 stars
About K-9 Mail
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.
K-9 Mail Screenshots
Tap to Rate:
Reviews for K-9 Mail
Bruce
12/30/2025
After using K-9 Mail for many years, it has become completely useless and no longer works at all. I had to delete it from my phone and install a different program. Very disappointing!
Neil Harvey
12/30/2025
I've tried a few email clients over the years, PC and smart phone, and this is by far my preferred mobile email client. Version 5.6 being for me, the ultimate. Having tried to stop auto updates, I hope I have now, finally got 5.6 back, and hope the instruction to download it from GitHub will solve the problem for good. Configurable, versatile, does all I need(multiple email accounts). Top marks to the developers. And in deference to the name, rest in peace Elizabeth Sladen(Sarah Jane Smith)
