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Kaiten Mail

by K-9 Dog Walkers

Price: $4.99
Sold by: Amazon Digital Services LLC
Available instantly

This app needs permission to access:

  • Read the user's contacts data
  • Read the sync settings
See all Application Permissions

By placing your order, you agree to our Terms of Use


Latest Updates

What's new in version 2.017
  • * Added auto-configuration settings for mailbox.org
  • * Added work-around for Asus Transformer display bug
  • * Added support for KitKat's Storage Access Framework that allows you to attach multiple files at once
  • * Use a locale-specific date in the header of a quoted message
  • * Added support for apps that don't know how to properly use Android's 'share' functionality
  • * Avoid adding the same recipient twice when using "reply to all"
  • * Fixed a bug with IMAP Push that could cause excessive battery drain
  • * Fixed problems with inline images not showing on KitKat
  • * Fixed a bug with bitcoin URIs
  • * Fixed color generation for contact picture placeholders
  • * Fixed POP3 STLS command
  • * Updated Dutch, Ukrainian, Brazilian Portuguese, French, Slovak, Danish, Russian translation
  • * More bug fixes

Product Details



Product Features

  • Supports multiple IMAP, POP3, Exchange 2003/2007 (via WebDAV) accounts. Push mail using IMAP IDLE
  • Rich text editing
  • Unified Inbox
  • Display contact pictures
  • Threaded message view
  • Split-screen view
  • Email signatures
  • Rich notifications (mark as read, reply, or delete directly from notifications)
  • Encrypt and sign messages using the OpenPGP standard (when APG is installed)
  • Lots of configuration options

Product Description

Kaiten Mail is a gorgeous and incredibly powerful email client for Android.

Features include:

• Supports multiple IMAP, POP3, Exchange 2003/2007 (via WebDAV) accounts
• Push mail using IMAP IDLE
• Rich text editing
• Unified Inbox
• Display contact pictures
• Threaded message view
• Split-screen view
• Email signatures
• BCC to self
• Rich notifications (mark as read, reply, or delete directly from notifications)
• Encrypt and sign messages using the OpenPGP standard (when APG is installed)
• Settings import/export
• Keyboard shortcuts
• Lots of configuration options

Please note that Kaiten currently does NOT support Exchange ActiveSync.


Support :

If you're having trouble with Kaiten, drop us a line and we'll do everything we can to help you out. We'd love to hear how you'd like Kaiten to improve. Join us at http://kaitenmail.uservoice.com/


Kaiten's origin:

Kaiten is based on the popular open source app K-9 Mail and was built by K-9's lead developers Jesse and Chris. By buying Kaiten you not only get an awesome email client, you also support the open source version because almost all of the new features are contributed to K-9 Mail.

The name is a play on K-9. Kaiten is a Japanese word that means rotation and sounds a lot like K10 or K-10.

Technical Details

Size: 3.2MB
Version: 2.017
Developed By: K-9 Dog Walkers
Application Permissions: ( Help me understand what permissions mean )
  • Read the user's contacts data
  • Read the sync settings
  • Open network sockets
  • Access information about networks
  • Access the vibration feature
  • PowerManager WakeLocks to keep processor from sleeping or screen from dimming
  • Write (but not read) the user's contacts data
  • Get notified that the operating system has finished booting
  • Write to external storage
Minimum Operating System: Android 2.2
Approximate Download Time: Less than 30 seconds

Customer Reviews

Top Customer Reviews

By B. Carlen on October 25, 2012
Verified Purchase
I use K9 Mail on my android phone and wanted a similar product designed for larger screens. Kaiten appeared to fill the bill--it is a fork of K9 Mail. Account setup and was easy--I'm using it with multiple IMAP accounts and the ability to aggregate into a single inbox is nice. Unfortunately, the product is chronically unstable on my Kindle Fire. It force closes often when I click to open an email from the alert bar. This often requires a reset of the device (hold power button for 20 seconds and then restart). This instability makes Kaiten hard to recommend without hesitation.
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I use Kaiten constantly on Kindle and my Android phone. It was simple to set up, simple to use. Very logically designed for all typical functions (sync, open folder, open email, view folder list, delete email, mark read/unread) to be available with a touch or touch-hold-touch. And of course settings for what to do with email on server after you download it to Kaiten (leave it there, mark it read, delete it)

Certainly worth the 5 bucks on each device. I am no power user, so cannot delve into finer points and arcane adjustments, but using email as my regular communication with clients and family, I recommend it without reservation.
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I was having a problem with my comcast e-mail, it simply stopped loading new messages. One of the fixes for this problem dicussed on amazon help forums was to use a Kaiten app. As soon as I bought this app, the comcast e-mail began to load correctly.
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This app allows multiple email accounts and many different ways to view your email. You can have different accounts for the same email address. If you access your Gmail on a PC you can create folders and filters. This app lets you have a different account for each folder. With the file manager app you can select new mail ringtones from your mp3 collection. This review will go to my Gmail but not my inbox. It has a seperate account for my Amazon Gmail with a different ringtone than my inbox account. I read in the change log that kitkat users have problem with compatibility. It works fine on my kitkat phone and it even works on my kitkat Amazon Fire TV Stick. Yes. I have a fully functional email client on my Amazon Fire TV Stick. (via AGK sideloader)
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I used the app several years ago in an Android tablet. Recently I got an Amazon Fire tablet and thought I would add an email client. Kaiten has gotten even better than I remembered. It has lots of settings, is easy to set up with multiple email accounts and it works smoothly and quickly in fetching and displaying messages. I tried the free version but I thought the ads were a bit intrusive. I'm happy to have paid for the commercial app. It's a great buy at the full price.
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Emailed developer regarding the Amazon version being 3 builds behind now. He blamed Amazon. This stinks...for a 5 dollar app, I expect better support than this. I'll amend my review if and when we start to get timely updates instead of being treated like step-children (and first adopters, since Amazon carried Kaiten first).

*EDIT* 5-24-11
Naturally, right after I left this review, Amazon posted the latest build (finally). In the meantime, the developer and I corresponded over email, and he has been terrific. I sincerely believe that he is at the mercy of Amazon for them reviewing the updates and getting them posted...so for that, he is off the hook with me. The updates that have been made are terrific, and once again, this mail client is the best available for Android (tablets in particular for me). The UI is clean, the split pane helpful, and the stability much improved. I expect only greater things to come from Kaiten Mail.
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clean and simple email. Just have to remember to hit the refresh button as your new mail wont sinc or show up unless you do. However Im sure there is an automatic sinc I havnt discovered yet lol Still very good and the only email app that was easy to figure out homestead email )Intuit)
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Just what I needed for the Kindle Fire. The killer feature for me is Identities aka, Personalities, or "Send As" - a list of your email addresses and associated signatures which you select from for your outgoing mail (new messages as well as replies). You only need this feature if you have more than one address or alias on the same inbox. If you have, it's a necessity that the built-in mail app lacks and Kaiten is the only Android mail client I know that supports it. Now I no longer accidentally reply to my business or club email with my personal email address.

It has a very flexible - if unusual - scheme for selecting which folders to display, which ones to poll and which ones should get pushed with IMAP IDLE for near-instant notification. The application lacks a help page or a user guide, which I needed to understand this feature, but I found the wiki guide to K-9 Mail (from which Kaiten was derived) helpful: [...]

(Find the manual at github if the link gets broken again).

It has an optional 2-pane display, useful if you have enough screen real-estate.

I can't comment on support - I haven't needed any. Once you get a handle on what's here, it works as it should. 4.5 stars (-1/2 for no doc; even a built-in link to the K-9 manual would be a good start).

Easily worth the $5. This is desktop-equivalent software -- no corners cut for being "only a tablet". It would cost 5-10x that on a desktop/laptop.

A year later: Still using it. I tried to find an alternative app when my Android tablet updated to KitKat. Nothing else came close. I'm using Kaiten Free at the latest rev while I wait for the pro version to be updated on the Amazon store. Five bucks? A designer coffee could make me a little more productive for a few hours. Kaiten makes me a _lot_ more productive for, well, a year so far, and counting.
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