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Kaiten Mail

by K-9 Dog Walkers
3.5 out of 5 stars  See all reviews (43 customer reviews)

Price: $4.99
Sold by: Amazon Digital Services, Inc.
Available instantly

This app needs permission to access:

  • Get notified that the operating system has finished booting
  • Open network sockets
See all Application Permissions
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Latest Updates

What's new in version 2.017
  • * Added auto-configuration settings for
  • * 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

  • ASIN: B004UBB1G2
  • Release Date: March 29, 2011
  • Rated: Guidance Suggested This app may include dynamic content. What's this?
  • Average Customer Review: 3.5 out of 5 stars  See all reviews (43 customer reviews)
  • Amazon Best Sellers Rank: #2,724 Paid in Appstore for Android (See Top 100 Paid in Appstore for Android)
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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

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 )
  • Get notified that the operating system has finished booting
  • Open network sockets
  • Write to external storage
  • Read the sync settings
  • Access the vibration feature
  • Read the user's contacts data
  • Write (but not read) the user's contacts data
  • Access information about networks
  • PowerManager WakeLocks to keep processor from sleeping or screen from dimming
Minimum Operating System: Android 2.2
Approximate Download Time: Less than 30 seconds

Customer Reviews

Most Helpful Customer Reviews
4 of 4 people found the following review helpful
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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2 of 2 people found the following review helpful
5.0 out of 5 stars Excellent full-featured mail client June 28, 2012
By JRobert
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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3 of 3 people found the following review helpful
4.0 out of 5 stars kaiten mail app fixes e-mail problems December 10, 2012
Verified Purchase
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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10 of 14 people found the following review helpful
1.0 out of 5 stars unread mail count still an issue July 24, 2011
Purchased for use on my HTC EVO. This app has the same issue as the K9 app. The unread mail count continues to refresh where messages already read are again marked as unread, over and over again. Had I known this was not resolved I would have stayed with K9 for free. Now I am out 5 bucks, I don't see any other functionality that justifies buying this when you can get K9 for free. Also, I contacted the developer about this issue weeks ago and he has not responded to me.
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1 of 1 people found the following review helpful
3.0 out of 5 stars so-so December 30, 2011
After a number of issues with the Gmail app and the Android email app, I began trying everything else. I really liked this app at first, but am growing weary of a few things. First, the constant false message counts. Every time I open the app, I have a different number show up. When I open the account there are no mails. Also, I have now seen masses of deleted mails reappear. It's not as easy to see as some of the other apps. Something about it makes it difficult, but that's personal with me. Last, when I send mails, I send a lot to undisclosed recipient, and use BCC. When I put contacts in the BCC, contacts open for me to chose. But, after everyone I choose, the contacts close. Then when I choose the next, contacts opens again at the "A", to start over and scroll through. Would be very nice if contacts stayed open and let you check each one I want. Five bucks is dirt cheap, especially since someone is working their butt off to make this thing. And I won't "scream" at the developers like some reviewers do. But I may write off the five as a donation and try something else.
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1 of 1 people found the following review helpful
Verified Purchase
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 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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Most Recent Customer Reviews
2.0 out of 5 stars No support
Support is a pain - no answer in weeks. Works fine if you use the basic features.
Published 1 month ago by TFL
3.0 out of 5 stars nice interface but does not delete mail on my server
I like the Kaiten Mail's clean interface a lot, but it doesn't sync properly with my accounts - notably does not delete mail on the server. Read more
Published 1 month ago by Gregorio
5.0 out of 5 stars Great Email App!
This product is the best for email in Kindle Fire HD. You can delete more than one email at a time and without it you can not. Works very good with no advertisements.
Published 2 months ago by The Grinch
5.0 out of 5 stars Email your way.
This app allows multiple email accounts and many different ways to view your email. You can have different accounts for the same email address. Read more
Published 5 months ago by Doctor JAM
1.0 out of 5 stars No good enough to make up for the lack of active sync.
With all the other mail apps out there that do support active-sync there really isn't much of a use for this.
Published 8 months ago by Rob S.
5.0 out of 5 stars so cannot delve into finer points and arcane adjustments
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,... Read more
Published 14 months ago by rick in houston
1.0 out of 5 stars can not make this app work
I entered every bit of info I had. I used my MAC email info, my kindle info and yet it will not work. As a third party app I can not get help
Published 17 months ago by Michael Alfonso
4.0 out of 5 stars works very well but there are some UI aspects that need to be...
I really like this mail client but wish there was a reply button on the ribbon that would reduce the amount of navigation i would need to use to reply to an email
Published 19 months ago by Clinton J.
1.0 out of 5 stars needed for imap personal and exchange for corp email
Too bad I bought it and was jazzed by the ui. It does not work with exchange. You can dig on the web or fish around and find this out. Too bad I own it now.
Published 20 months ago by Thomas J. Lynch
1.0 out of 5 stars pretty good, but does not work on KitKat
This is a reasonably good mail program, though I found the options take some digging to find them all.

Once setup, it works well. Read more
Published 20 months ago by Eric Deslauriers
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Dec 7, 2013 by JRobert |  See all 2 posts
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