K-9 Mail

Mozilla Thunderbird

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.

Ratings and reviews

New interface is awful....now clicking on the hamburger menu shows a pill-style interface, and I can't tell which account I am looking at unless I click through each pill, one at a time. Just an awful change. Not sure how this got past UA testing, but at least give us an option to reskin if there is going to be such a mess to deal with, especially for users who do have mtiplr email accounts.

Switched back to this from Blue Mail because they never responded to support emails. It's a decent alternative. However, the new UI is HIDEOUS! Also it takes a while for the number of unread emails to go away after reading/deleting them. Sometimes, deleted emails come back if the number of unread mails doesn't go away

9/30/24 1 star. Stopped working. No longer works with self signed certificates. And maybe has issues with older security protocol. No option provided to allow acceptance/by-pass the way we can on a browser. 9/23/22 4 Star. Has been working fine on new phone. I've setup ssh tunnel and access email via port forwarding. This has no impact on this app function. I got dozens of email boxes setup. Multiple signatures. Many alias email addresses. Multiple biz brands and domains.

What's new

- New folder drawer design
- Simplified folder management by revising display and push classes

For a full list of changes check out https://github.com/thunderbird/thunderbird-android/releases/tag/K9MAIL_8_0