K-9 Mail is a communication app developed
by Mozilla Thunderbird.
The APK has been available since before 2010.
In the last 30 days, the app was downloaded
about 14 thousand times.
It's highly ranked.
It's rated 3.35 out of 5 stars, based on 95 thousand ratings.
The last update of the app was on May 8, 2025.
K-9 Mail has a content rating
"Everyone".
K-9 Mail has an APK download size of 10.78 MB and the latest version
available
is 10.0.
Designed for Android version 5.0+.
K-9 Mail is FREE to download.
Description
K-9 Mail is an open source email client that works with basically every email provider.
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★★★★★
Synced smoothly with all of my email accounts and accessed every folder for each of them which makes properly organizing saved emails from one app possible. Decently small app size. Well done! The ability to create new folders would be useful. Doesn't work with slow internet.
★★★★★
Failed. Got on adding an email address from Google: This app is blocked This app tried to access sensitive info in your Google Account. To keep your account safe, Google blocked this access. Updated. Zoho email address does add successfully. Microsoft email address DOES add successfully.
★★★★★
It's a pity it isn't possible to create new e-mail folders, only move messages to existing ones. Apart from that, that's a great mobile e-mail client.
★★★★★
Best replacement for stock telco/android email apps that start to have problems after a year or become bloated. Light, fast, dark mode and options under the hood (synching options + more). It works best for my personal email needs. You can set it to use "push" so you get mail quickly or use "fetch" on a schedule. [GMail is good as r many others, but I want an app for my personal stuff not accessible by corporations. Open Source!
★★☆☆☆
I can't log in my gmail account as it says Google blocked login for security
★★☆☆☆
I wanted to like this app, but I don't. It does not sync emails despite my global settings. Have to constantly refresh manually to download messages. The layout is okay, I like the unified inbox, but that's about it. I have to constantly tell it to show remote images and/or download complete message manually, as I have not been able to locate a global setting for this. It's a pain. Going back to Mozilla Thunderbird.
★★☆☆☆
Hi, Every time I'm trying to send an email with or without an attached document, it won't be sent but instead end up in the outbox. What should I do? Because I've used another app and that one gives me the same result but tells me that my email has been classified as spam by my email provider, so I believe this has something to do with my emails considered to be spams by K9 mail though they're not because when I send emails through my regular email client it works just fine. Thanks
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