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K-9 Mail

K-9 Mail is an open-source e-mail client with search, IMAP push email, multi-folder sync, flagging, filing, signatures, bcc-self, PGP, mail on SD & more!
K-9 supports IMAP, POP3 and Exchange 2003/2007 (with WebDAV).

K-9 is a community developed project. If you're interested in helping to make the best email client on Android even better, please join us! You can find our bugtracker, source code, mailing list and wiki at https://github.com/k9mail/k-9We'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.)

Category : Communication

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Reviews (22)

Max. P. Nov 2, 2019     

Great app, nice and fast interface. I don't understand why their are so any bad commentaries recently saying this is "abandonnedware". The app works great for me, no sync problem. The interface looks good enough for me, not outdated at all and it is very responsive. It lacks a few options like a delay before the email is actually sent, or automated support for calendar invites but it is acceptable.

Den. L. May 23, 2022     

I DO NOT like the new version I installed on July 26th 2021. It is harder to navigate. I liked it just the way it was. I need polling sooner than 15 minutes for 2 of my 4 accounts. I takes a LOT longer to do everything with the new version. If you ask me a step backwards. However, I understand the changes Google requires and some of the changes might be driven by that. I was so excited when I saw an update. I wish I had waited. Thank you to the developers of this app for their efforts. ******** I have increased my rating with the latest update to the app. It is easier to work with using 4 email accounts. I DO WISH they would enable a shorter email check interval. I have one email that I am often engaged in serious exchanges and having faster fetch would be a big help.

Sof. N. Apr 22, 2022     

I changed to 4 stars now, in my view it is better. One thing missing in the general settings/notification. Is the possibility to add a general sound to all 'thicked' accounts, if you add accounts list with checkbox. All non checked ones, will either use default or sound selected for that particular account/s. Addition I still hear same default sound, even though I set some different for different accounts

TD. 7. May 21, 2022     

Generally it's great, but no has this line reading 'find out whats new in this release' stuck on the bottom of the screen, with only an 'ok' option. That's NOT ok. I don't want to read things like that. Give a 'cancel' option, or at least stop it after the first 10 minutes. Fix this and I'll give 5 * [Edit : have turned that setting off as described. Partial fix. Please add it to the normal settings window in a near future release!]

Ben. P. May 16, 2022     

The new interface looks nice, but I do miss the home view which shows all email accounts and which have new emails. If anyone else is annoyed by the "unified inbox", you can turn it off under settings->general->display->show unified inbox

W.. B. Apr 26, 2022     

Excellent replacement for stock telco/android email app that started to have problems sending emails. Light, fast, dark mode and options under the hood (synching options + more). Have been using updated app through beta program for about a year. It works well 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 accessable by corporations. Open Source!

Ash. K. D. May 4, 2022     

This app gave me the best email experience so far. I seek simplicity and speed at the same time, and K-9 Email client is exactly what I need. Uninstalled the laggy and resource hungry MS Outlook email client. Thanks to the team who brought this cool app. My request to the dev team is, add new features if you wish but never compromise with simplicity and speed. We want the same feel in future builds as now.

Ber. N. May 5, 2022     

Needs some improvements. Please bring back a default opening screen where you can browse through and refresh all of your email accounts. The star folder in each account was also a much faster way of searching/ sorting with star marked emails. Thanks this seems to have worked. I usually try to avoid this type of method b/c some developers *cough*Samsung*cough* shamelessly harvest personal info but the client is no longer asking for my permissions each time I re/open the app so I am happy.

hep. e. May 16, 2022     

The old layout before this 2022 update was marvelous. The new one hiding my email accounts behind a combo box makes my work hard and it is detrimental for the usability. Please restore the way it was and then deserves 5 stars!

The. A. Feb 22, 2022     

I have been using K9 for almost 10 years and loved it. But now the recent updates have made it almost unusable. Fetching takes forever. I can login to webmail faster, so what's the point. Also search is abysmal. I don't know what field the search uses but it doesn't find words that are clearly there. Then when I search the server, it only returns the subject line, no content. I have to wait for content to come in, then all of a sudden all the items disappear and i have to search again.

AKI. May 18, 2022     

Would be a great app if there would not be the bug with the account widget. If you use the power save mode, the widget for account stops to work after resuming from power save mode in the way it brings you to the default account inbox instead of the inbox of account, which was defined by the widget. This bug makes the account widget useless.

Mic. B. Jan 28, 2022     

After an hours use it still will not sync anything no matter how many times I manually refresh, unified inbox -blank, outbox -blank, reinstall samsung email and everything is there. Double checking and rechecking the settings in case I missed something but it simple will not pull all my mail. Its a shame when it is samsung email I am trying to move away from.

mar. f. May 10, 2022     

Edit:Still happy with it! But I lost the notification on android 12.1... All the permissions are given... I have no idea what could be the issue... Very reliable mail client. I love the new ui! Maybe a compatibility with proton mail would make it perfect...

Ari. H. Jan 30, 2022     

Right now it's riddled with bugs. - "fetch up to" function skips messages above the limit (not just downloads first kb of message). - "local folder size" properly limits amount of mails - but doesn't care about the DATE (you may get just very old messages - not the one received 5 minutes ago). - UI/UX is garbage compared to old version.

Nop. N. Feb 22, 2022     

Tried to use this previously and it was far from user friendly. Thought I'd give it another chance, and well, nothing has changed. 6 emails, all different providers;2 smtp, 2 IMAP, 2 pop3. No e of them will connect and ive double checked all the settings, as well as having my it department. Done.

Har. E. May 25, 2022     

Can't even add an email account now. Server settings are not even working. After adding an email, only Outbox folder is shown. Useless application. This update has made it unusable.

YE. U. Mar 1, 2022     

I have used this program for 20 years and miss some of the old functions. Prefer touch functions to gesture which seems to be the trend. Load up 25 more in folder I miss and Clear Local Messages instead of delete. Please put back Clear Local Messages for local folders. thanks

Chr. B. Mar 16, 2022     

It's not perfect but it has a good balance of features vs. accessibility. The UI is a good mix of a classic email client with a slightly more modern and simplified approach. In my opinion, the user interface has improved over the years. Also being open-source software is a plus and my privacy is respected.

Fra. Apr 21, 2022     

The new UI is just terrible. There is a reason why I don't use Gmail or Outlook, but now K-9 has a similar UI experience... :-/

Don. I. Apr 25, 2022     

Been using it since 2011. Well thought out. I have had it on several Samsung phones, 2 LG phones and now a Pixel 6 Pro. Never had an issue.

In3. M. May 22, 2022     

Please bring back showing all accounts on the main page like the prior version had. 5 stars when you do. 052322 still no show all accounts on main page option.

Yuu. O. Feb 1, 2022     

Terrible new UI 😰 Switching between multiple inboxes is a PITA →🐢 Sender in list of mails now in BOLD font →cannot change/cluttered design. Instead of date the weekday is shown for last 7 days →inconvenient. Problem of selecting ☆ scrolls the list instead of starring ★ the mail still present (stars overlap scrollbar). Message view now wastes space (header). Was forced to update from 5.600 version due to K-9's POP3 AUTH bug (authentication stopped working with Ionos accounts 2022/01/24).🀚