K-9 Mail

- March 22, 2017

Everyone

Communication

( 86,195)

Description

K-9 Mail is an open source email client with support for multiple accounts, search, IMAP push email, multi-folder sync, flagging, filing, signatures, BCC-self, PGP/MIME & more!

K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).

Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.

K-9 is a community developed project. If you're interested in helping to make the most popular open source email client on Android even better, please join us! You can find our bug tracker, source code, mailing list and wiki at https://github.com/k9mail/k-9
We're always happy to welcome new developers, designers, documenters, bug triagers and friends.

If you're having trouble with K-9, please report a bug at https://github.com/k9mail/k-9 rather than just leaving a one-star review. We don't mind you telling the world that you're frustrated, but if you use our bug tracker, we have a better chance of fixing whatever's giving you a hard time.

You can find K-9's release notes at: http://bit.ly/new-k9

(People sometimes call K-9: K9, K9 Mail, K-9 Email, K9 Email, K9 E-Mail, k9mail or k9email.)

Reviews

4.2

86,195 total

5 51,057

4 19,402

3 6,744

2 3,566

1 5,426

Leah Richardson

Great when it works, but for the past few weeks it has stopped syncing, it says syncing disabled at the top but all the settings are correct. I have tried uninstalling and reinstalling to no avail. Missing important e-mails when they come in due to this, and having to constantly manually refresh the email in order the check for messages. Also opening messages has slowed significantly, even just plain text messages take 20-30 seconds to load. Would be five stars if not for these issues.

xXx Geek

Works great with Android 7.0 after a few setting changes. Go to your phone settings, battery and optimized battery usage. Scroll down to K-9 Mail and make sure it is turned off, next go to default application settings and set K-9 Mail as your default mail application, if you have trouble changing to default, install 'Default Application Manager Lite' from the play store. Now K-9 Mail will automatically sync when screen is off... Enjoy!

L Fyg Uu

Encryption features get better. One important one missing though: Should allow to save messages unencrypted if the server is trusted. This option is crucial for more user friendly work. Also: opening messages got quite slow since some updates ago. If both issues were solved it would be 5 star!

Alex Esterkin

Update (June 2017) stopped synchronizing. Lowered my rating, but not yet uninstalling. /// Update (Dec 2015). Still by far the best email client. /// (2013) I have used K9 for several years for my non-gmail account. The current official version is 4.409, and it is excellent. However, today I installed the latest version posted at the K9 Mail developer's site, 4.512, and additional improvements make this email client stand out by some distance. Even in comparison with Gmail. Wow!

A Google User

Used to be the best mail app I used but the latest update has changed how notifications work. Instead of going straight to an account's inbox it just goes to a list of folders instead which means an extra tap... An option would have been great for any UI changes. Reading mail was a lot quicker before this. It's also getting quite buggy... Emptying trash doesn't free up space any more. Either numbers not updating or it's really not being freed. Sometimes an old email gets marked as unread or suddenly my emails are duplicated... Some aesthetic update wouldn't hurt like some icons.

David Fix

I've used this app for several years and the fact I could easily set it up for multiple self hosted accounts was initially what drew me to it. Lately I've noticed all too often connections are not released on the server end and due to that ill have to ditch K9 for something else. If that issue could be resolved I may come back

User reviews

Leah Richardson May 7, 2017

xXx Geek July 19, 2017

L Fyg Uu March 24, 2017

Alex Esterkin July 1, 2017

A Google User March 22, 2017

David Fix June 4, 2017

May 8, 2017

Bug: The notification icon does not go away when I open or delete emails. Put the attachments back to the top of the email as it used to be. Prevents unnecessary scrolling to end of mail. I want to use the dark theme but then all colors in emails text are gone. Not even negative colors; only plain white text. Not useful. Please fix.

Tomasz Fiszer April 1, 2017

Not the best, some weird design ideas have been implemented. Where's the empty trash, or spam. Selection looses the read/unread visibility, makes it hard to distinguish one from another. There should be swipe to delete or mark read, etc. Other than that, it reads emails ok, has great level of detail for headers, the choice of colors is questionable and wpuld be better if I could select my own bg/fg for any content. Notifications while useful, don't work properly, as mark as read or delete buttons never actually do anything. Hope it will improve.

Steve Hatton April 16, 2017

Little problemette since phone updated to Nougat, K9 keeps showing Syncing Disabled. Have to maually synchronise email . Pity, as Iove the app. I've, been using it for several years on a Samsung SIII, Sony Z4. Not found anything that gets close to it for versatility and functionality. .K9: V5.206 Android: V7.0 Samsung Galaxy S7

June 20, 2017

I have to admit, I was hesitant to take K-9 Mail for a spin because it's not much to look at and it didn't appear to offer anything particularly special... But whilst others may look pretty, I don't trust some of them as far as I can spit, so I decided to try-out K-9 Mail - and I'm glad I did! The everyday user will find that this is a fantastic e-mail client, while power users will be in heaven with the enormous amount of options and settings readily available. My only real complaint - and it's a big one - is that at the time of writing, K-9 Mail does not support meeting invitations/requests... Add support for that, and my (Google Play Store) review will be much higher.

Ankur kainya April 17, 2017

There is an error showing in attachments and in Text messages too. The attachments dont open and text messages dont appear properly, the messages are in Some software language. The attached file also shows as "winmail.dat" file. Off late k9 mail is not doing good. If not rectified soon, will shift to other App.

June 17, 2017

This email client offers some nice advanced configuration options and it is open source, but like so many open source projects the user interface undermines all the back end magic. The UI is so terrible here that I find the entire app unusable. Uninstalling and now in search of something that was made for use by people other than the developers.

A Google User May 8, 2017

All you'd ask for in a basic, reliable package. Truly wonderful email app is clean, near idiot-proof and the closest thing to an essential download, particularly if you've many accounts. One of the best free apps ever devised, it's also remarkably lightweight and easy going on resources, thus even the most basic smartphone or older device remains an able email hub. Thanks, devs!

Marco Costantino May 11, 2017

I have a problem. Before when you deleted a message or you moved it to another folder. You could then view the message properly in that folder. In the last two versions you cannot any more view properly messages in another folder if you added one unless you resend that folder from scratch which is very annoying. So the application got recently a lot lot worse..

Scott Parker April 5, 2017

Latest update makes it a PITA to get my mail. It says its "loading" them but it just hangs. Tough to be more useless as an email app really. I gave 2 stars because I used it for years and has always worked great. Uninstalled.

Shugg McGlummfer July 11, 2017

Latest update is hopeless. Now can't send emails from one of my accounts - UPDATE: fixed by recreating accounts, every folder had to be recreated. The new Send screen is of poor design with the contacts taking up too much room. The app now crashes every so often, didn't happen before. Very disappointed. 7/17 - all of a sudden it can't connect to my Yahoo account, authentication failed. What's going on? Started working again without any changes from me. Rating back up to 4.

george e July 11, 2017

Warning, will not work with nouget on phones or ob tablets, not sure why k9 will not fix. Problems, sync dissabled. will not poll or sync emails unless manual refresh since phone 7.0 nouget update. Can not find workaroud on samsung s7 edge. Not sure why k9 is not fixing. I HAVE CONTACTED K9 DIRECTLY, NO RESPONSE. not sure why they r ignoring all the sync related complaints. Too bad. It was a great app for years. Looks like people r recomending switching to blue mail app with no problems. Please advise

Alberto Bonini May 22, 2017

Sync with mail server has become dysfunctional since latest app update. It will start sync and stay stuck in sync mode until I force stop the app and restart it. This has rendered the app useless. Worked great for past 3 years now it's a wreck!

Bernard Riches June 30, 2017

I could live this but every now and again it stops working due to authentication problems. Today it happened again with one device working fine whilst the other fails authentication. Had enough as to reset the setting all over again is not made easy on this app. Any suggestions as to a better App welcomed.

Jean-François Alarie April 3, 2017

The scroll bar on the right overlaps the message stars, which makes this app unusable if you need to star and unstar messages. Is anyone from the K9 project using their own app?

Glenn Wilkinson May 7, 2017

Fantastic app, but recently stopped polling for new mail in the background for me. Very occasionally works. Always polls immediately on opening though. Moto G4 android 7.0. Sure it will get sorted (please!). Blacklist capability would be good addition but know there are technical complications with this.

Trevor Sneath April 27, 2017

Will not let me set up gmail accounts. Not even using manual setup. Tells me my username or password is wrong; it's not. No problem with setting up yahoo accounts though. Turned on Allow Access settings in Gmail. but k9 still can't get past the first stage of set up for it

May 2, 2017

Dear Devs. Thank you for reminding of animal cruelty. I will donate if God willing soon. Please add personal email signature support and K9 ends all competition effective from moment I can send a professional work email. Thank you very much.

Rich W May 23, 2017

For me the '' authentication failed'' problem was solved by going into Google security &( less secure apps) ticked on.. I know who wants to do that??!! before I couldn't even sign on now it lets me

Thomas Adams April 29, 2017

New update has been performing great, Best email app I've used! Keep up the great work! Previous: May the requestor for this feature forever be bombarded with pop ups to confirm every action ;-) ps would appreciate zoom back. Move attachments back up like every other email app!

Nick Prasert March 23, 2017

The new update causes the mail not being retrieved. Twice now that I had to open the app and click refresh. Then the emails show up. Please fix my favorite email app. Thanks.

Mike Bola May 28, 2017

app consistently keeps on notifying me that a new email has been received but the email is an old one and reappears as unread and new. very confusing. i have mistakenly replied to emails twice which were days, weeks or even months old

Charles Roberts April 1, 2017

Worked fine for years. As of most recent update, no more push emails, I have to actually start the app and then force it. Always displays syncing disabled no matter what I do in the settings. Really sucks because this was always the best email app. It is useless right now, and I will have to use some other app that isn't as good if it doesn't get fixed. Are you listening?

Rob Garneau July 8, 2017

July 2017 update: Still crashing frrquently. I have sent dozens of crash reports. Most often crashes when reading email and rotating my phone from portrait to landscape. With certain emails, problem is repeatable every time. Wish you could move an email between email accounts. Long-time user but frequent crashing has caused me to switch email apps. :(

K-9 Dog Walkers July 9, 2013

Please create an entry in our bug tracker: https://code.google.com/p/k9mail/issues/list

rainer zufall March 28, 2017

Would love to use it!! Unfortunately k-9 has problems with my exchange mail accounts. Can't register, although I use exactly the same parameters as with the stock mail app or even others apps I tested (gmail, outlook,..) Just k-9 can't handle it :(( PS. Please also rework your logo, design. Thanks!! ))

A Google User April 25, 2017

It finally got so bad I had to go to Blue Mail. It works great. K9 stopped pushing, no notification sound or led. This was on both the LG G5, and Galaxy S8. K9 just does not work any more. I used it for years then it just crapped out. What happened? I would love to know how this went from one of the best email apps to one of the worst. Just look at the ratings. I remember when it had like a 4.8. Now it's junk. Use blue mail. Much better.

Marc Vernhet May 8, 2017

Very good email client! FIX FOR "SYNCING DISABLED" : It's caused by your phone battery management that kills the poll. Go to your settings, search for battery management, and look for k9 and define "ignore battery optimization for this app". This procedure may differ with other phones but the problem is caused by this.

Harold Gaskill April 6, 2017

I really wanted to like this. Unfortunately it is unusable. Insisted on downloading my entire POP3 account. Never made it to 2017. Now it will only download 6 messages at a time. It will never make it to 2017.

Carol Wiesner April 26, 2017

I know Hotmail/Microsoft seem to be having server problems, so I won't blame the slowness on K-9. I just think Blue Mail has better features for me, so I'm switching.

Robert Uomini June 27, 2017

I like K-9 Mail, but the latest update to ChiaraMail just blows it away. The new UI, server-side search, ECS support... It all adds up to a cleaner, more full-function mail client.

Jim Wells April 5, 2017

I've had trouble since the last update when I try to choose a key for signing and encrypting emails. K9 simply fails and goes back to the place it was before I tried to choose the key. Fix THAT and it is a 5 star program.

A Google User June 29, 2017

A few annoying quirks, but good overall. Messages from yahoo still show in the count until deleted from the page and I would like it to start in a folder view. A few other random issues here and there, but not so often that I can remember what they are right now.

Chris Dow July 8, 2017

Doesn't handle Exchange accounts very well, if at all. 4 years ago it wouldn't add my work account, and now that we've moved to a new system it still doesn't work. Very disappointing.

Andy Thompson April 15, 2017

Update: it became so bad after updates, very slow downloading new mails, crashes when deleting mails, reply rarely works. Now uninstalled and using a different app.

Paul Cooley July 3, 2017

Working yesterday, not working today. Nothing has changed but now says passwords not recognised. This is the second time this has happened. Probably going to have to delete it and try another app.