K-9 Mail

- March 22, 2017

Everyone

Communication

( 86,060)

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

86,060 total

5 50,994

4 19,380

3 6,729

2 3,556

1 5,401

Marco Costantino

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

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.

A Google User

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.

Alberto Bonini

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!

Trevor Sneath

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

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.

User reviews

Marco Costantino May 11, 2017

Scott Parker April 5, 2017

A Google User April 25, 2017

Alberto Bonini May 22, 2017

Trevor Sneath April 27, 2017

Leah Richardson May 7, 2017

L Fyg Uu March 24, 2017

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!

SeaJay Oceans June 19, 2017

Testing it sends two emails out for each email you send. I have no idea who it is shadow copying all outbound emails too - I will have to do packet inspection to see what is going on with hacked K9 mail.

David Fix June 4, 2017

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

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

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.

A Google User March 22, 2017

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.

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

Don James April 22, 2017

I have used this application for years and loved it. Unfortunately with the syncing disabled issue popping up on my S8 and happening continuously I can no longer afford to use it. When it worked it was great.

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.

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!

Scott Reichman March 22, 2017

Possibly a good app if it was dragged out of the stone age. Exchange 2010 is only 7 years old so far but unusable on this app - gotta be taking the piss

george e April 16, 2017

Warning, 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

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.

Joe June 21, 2017

Disappointing decision to move to the new Gmail-lookalike way of displaying email addresses, this broke ability to cut and paste a list of email addresses into the client. How do I turn this off? Not needed, not helpful. I use K9 because it's not the gmail client. How is it helpful to display just the first letter of an email address? Can you go back to providing an alternative please?

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.

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.

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?

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

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!! ))

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.

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.

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.

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.

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.

danielle pinon April 21, 2017

I love that i can set custom notifications and can delete all 3000 emails at once. I also love the easiness of maneuvering through it. EDIT: after Nougat i can no longer rely on K9 as syncing somehow seems to be disabled. I've been missing a lot of important emails due to it. Had to uninstall

Martin Mehawk March 19, 2017

Been using it since the very beginning of Android and while I've often looked around, this still remains the best email app for Android. Everything available for free, highly customizable and it's open source to top it off. Easy 5/5.

Sophie Loe March 27, 2017

Functionality removed: copy and paste corrupted any an email addressesfrom the To: or cc fields. Always "" Functionality was available in earlier versions.. Still K9 is the best smartphone application.

K-9 Dog Walkers December 31, 2016

K-9 Mail only removed support for unsecure protocols/ciphers. It's almost 2017, time to switch to an email provider with decent security.

Mike Smith April 2, 2017

Had this since it first came out and it has been great until Android v7 now it constantly keeps having synching disabled. Even tried white listing in doze and that didn't fix it. Is it game over?

Jae Faith April 1, 2017

Lately I've been having issues where it won't push emails for hours. I'll try to manually refresh and it shows there are emails but it won't "grab" them. I have to uninstall the app and reinstall monthly. Looking for new app.

A Google User April 8, 2017

Used K9 for many years but now notifications totally not working on Android 6.0.1 Galaxy A5. In spite of settings configured to notify of incoming email. Have to dump this and use Gmail app, which notifications work ok.

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.