K-9 Mail

Mozilla Thunderbird

In-app purchases

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.

Ratings and reviews

I've been using K-9 for years, and overall its feature set is exactly what I want. However recently, I presume after the most recent update, it's regularly crashing. either hitting reply, or launching it as one of the edits to share something. it's not so bad it's unusable, but I'm spending a lot of time doing things twice. which is a shame for something that's always been so solid in the past

I loved K-9 before this update. But now it's so hard to distinguish between my accounts in the menu. Before, I'd given each one a different profile pic and color, so I always knew which account I was looking at. They also appeared in a set order, so I could navigate easily. Now 4 of my 5 accounts are labeled "GM," and the highlight color is the same for all 5. What?! AND each time I open an account, the list order shifts, so they're never in a predictable order! Wish there were a way to revert.

Used this happily for years. But the recent change adds nothing useful, and takes away great features (can't set the notification light color, can't set the vibration pattern). And on my wife's phone, as well as a friend's, it simply doesn't send outgoing mail. No warnings, no apparent errors, messages in the Sent folder. But nobody receives them. I might roll my version back, despite being cumbersome. Or I might look around for other options. In its current form, I don't recommend this app.

What’s new

K-9 Mail version 18.0

New:
- PNG avatars
- Setting to display ISO date/time in message list
- Fixed-width font for composing

Changed:
- Attachment summary moved to header

Fixed:
- "Delete (from notification)" setting did not retain state
- Find folder search hint text was cut off
- User not notified if offline when sending message
- CC/BCC fields were not expanded by default for Reply All
- Crash occurred when retrieving images
- Deleted messages could remain visible in message list