Gefällt eigentlich gut . funktioniert nicht immer . Ausschlusskriterium so far. Da OpenSource werde ich's ab und an wieder testen.

Light weight, functional and stable The Android default email app is v boring n dull. I use K-9 for my two Outlook, one Yahoo and one own domain accounts. My two Gmail accounts are handled by default Gmail app. Though I thought it was slow in push notifications, but that seems to be working ok now. Everything I want from an email app works flawlessly in K-9. It's lightweight and superior in overall performance. Thumbs up!

Rapid sync, no clutter, privacy Thanks to the developers for this wonderful application which replaces my android stock app. I almost gave up on finding a mail app which doesn't ask for a ton of permissions until I found K9. A few minor suggestions for improvements: It should be possible to move mails to folders of different accounts, and generally the moving of mails could still be simplified. Another desirable feature would be a rapid delete gesture and an undo button for the last move/delete action.

Edit May 18th 2016: Has started reporting wrong sender in emails. Headers are correct, but every email is being reported as coming from a single sender. Minus 1 star... Previous review : Much better than the stock email client. A big plus is allowing multi-select and unified account view options

Much better than factory mail client I love that you can store messages on the SD card as I was running out of memory on the device storage. I have Exchange sync perfectly an IMAP account and also Gmail and everything works perfectly. For people having issues with Exchange Google which URL you are supposed to use.

4 years of happy mobile mail :) This is an outstanding email app! It works perfectly, super customizable! Also has a very unique and comfortable interface. It's that simple to describe it, nothing else to say, really, because it's just great! Last year, when I bought a new phone, i didn't even try its own mail client app because i got used to k9 a lot. Thanks for your great app and amazing support!

Did work, or so I believed This classifies some of my emails as SPAM, so they miss my inbox!? Can't return the mail to my inbox - too much beating around the bush! Can't risk missing any important messages, so next step: TOTAL REMOVAL (uninstalling it, if that's your jargon).Gmail is a more reliable source, anyway. Thank God I still have it.

Goodbye K9 Sad to uninstall K9 as I have used it for years. I like its visual approach among other things. But its become buggy/unstable and now I am faced with syncing disabled and no way to fix it. Emailed support and was directed to the manual and G+ community. No fix in manual and post to community asking for help unanswered. Had no choice but to make the switch to another email client for android. Sorry K9 but I guess all good things end. Bye!

Very Sad So recently I've been having problems with K9 mail and despite my best efforts it still persists. I have had problems checking my other accounts on it after checking one of them, for instance if I check one email account and then try to check another the program just hangs. I have to clear the cache and force a stop for it to work again. So that being said I'm switching.

Stopped working :-( For some reason today this has just stopped working. I've cleared my cache, now tried uninstalling and reinstalling but get so far in the setting up process and each time the app just crashes, over and over. Today I missed a very important email because of this, and STILL can't get it to work. Very unhappy.

K-9 Mail Being a Whovian for many years, i remember when Tom Baker got that tin mutt, but my previous adventure with this email client wasn't good. Now it can't do automatic setups! Even providing an SSH server is a Machts nichts help. What IS your problem?

Push isn't reliable When the display is off for a couple of hours, push notifications aren't sent any more and a manual poll has to be done to resolve the issue. Update: Now, even manual polling gets stuck. Switched to GMX app where push works even after I get up in the morning. After using K-9 for so long, this seems like a miracle to me....

I'd like to use it but... Seems it doesn't want to accept my works email exchange account. Keeps saying a valid url for the exchange account could not be found. It's funny because plenty of other email apps don't have a problem. And why are the time and date on the emails so far behind the actual time and date? Get it sorted, K9!

Really Impressed This is the only email client I've found on Android that does email well. PGP support, integration with key chain management apps and easy to use generally. Was a bit confused by the UI initially when changing between accounts because the UX doesnt quite follow 'normal' Android approachesl

User folder and please Please please please please allow at least one user folder, eg "Pending" (pop3) - then you'll get your otherwise richly deserved 5th star. Sometimes deleted emails arise from the dead again. But apart from that, it's a great app!

Have used it for years but now too buggy Over the last 3 or 4 months my Hotmail that I delete comes back randomly as new mail (I've deleted some mail 10 or 12 times over 4 months) and now all of the emails i had today have disappeared after I switched my phone off for a flight. Can't keep working like this, I'll have to move on...

Great app..... but! I have used K-9 for several years now and think it is the best email app to use on Android........ it does however need a multi-delete option as it's pain deleting emails one by one, and there needs to be font options for sent emails.... otherwise faultless

Sub folder sync support Although mail usage is dominated by Gmail and Outlook, K-9 plays a very niche role. It allows user to configure the mail they would like it. So you can do things like subfolder sync, periodic notification (instead of relentless push). If you are a power user then you would really love it as the app completely moulds itself according to your preferences.

Problems sending email and numerous crashes I have used and loved this app for several years and thought it was the best email app our there. But on my new S7, I am having nothing but trouble. Constant problems when sending emails and crashes at least 4 times a day. I will be uninstalling and trying to find another app.

Used for quite some time I have always been delighted with this app but recently it seems to entirely hog resources when checking mail. This is a particular difficulty in a poor service areas. The wee circles just sit there blocking any activity on the phone until you give up. There seems nothing that can be done to stop the sync happening in this case other than switch off. Nexus 6 latest Android.

After trying a number of different apps, I was frustrated by the overkill so many of them thrust upon you. I wanted a clean, fast, truly useful app for using on my phone quickly and easily. After using K-9 Mail for a while now, I am completely happy with it. I appreciate being able to set the "dark theme" for one thing. I also appreciate being able to simply click on the icon and get an immediate, updated list of my emails with the first couple of sentences included. It is all easy to scan and scroll through without a lot of unneeded visual garbage or options. When you need an additional option, it appears at the logical place and time, not all the time whether you need it or not. Everything is easy to set and use, and K-9 integrates well with my Google email account. This is one of the very few apps of any type that I've found to be genuinely suited to and useful for quick-and-direct cellphone use.

So many problems I delete an email and it still shows in my inbox, multiple messages dont ge sent, delays in updating mailbox and syncing. This is the worst email app ive ever used

Like it so far No fault in the app but Google has blocked me from signing into my Gmail account because this app doesn’t meet the security requirements. Sure that’s just an excuse for them to get me to download the Gmail app.

Best. 2nd device so far I like K9, it's so far the best app for multiple accounts and with no single ad! Thank you ! Thank you ! Thank you ! It take some time to figure it how it works, but when you get it, it's a piece of cake. My second device so far with it. I tried on this one some newer email aps, like BlueMail, but they have lots of ads, and pop ups for comercials, so I got the old one, old but gold K9, and I'm in piece now. K9 is maybe a litle complicated, and maybe look outdated, but it's all crap. THIS APP RULZ!

Best solution for iCloud mail on android but... ... An absolute data and battery hog on mobile. Had real battery and data issues: battery would barely last half a day and found K9 was the culprit. Found this out through a warning from network that I'd used almost all my monthly data limit and K9 had used over 3GB background data in a week, without any significant emailing! Solution was to disable background data for this app which means it won't do push email on mobile, but this is a small price to pay to have the phone behave. Sort it out, please.

Good An excellent app. Simple yet functional. The level of utility is awesome. Have used it consistently for years across several devices. I take away one star bcoz of security concerns raised by google. All my main mailboxes are google...

Push notifications don't seem to work reliably. I can see open IMAP connections to the server but it won't report new messages. Doing a manual "fetch" will eventually retrieve new messages but takes an inordinate amount of time. Disabling power saving features doesn't help. Android 6.0.1 on Nexus 6P.

Best multi account mail app Much more configuration options than mymail, better visually too, can be dark background everywhere. Wish this existed for desktop PC as well. I would prefer k9mail over Thunderbird anytime! Don't like the dog association, what does k9 have to do with email? Dogs are a huge waste of resources by the way. 8 billion humans weren't enough of a burden to our planet? But I digress.. Some complain about the interface being dated, but for me that's the reason it's the best app for email out there. Very efficient!

Awesome app, but unable to star emails I've used this ever since i got my first android phone over five years ago, and love it. The only thing that could be better is a fix for starring emails - when tapping the star on an email, it scrolls the interface instead.

Battery drain I like k9, but it's a major battery drainer on the latest Android. Also according to the reports on the intarwebs I am not alone with that problem. Apparently it does let your phone go to deep sleep (wake lock and/or mobile active)

5 Star You'll never use another email app. Simple, reliable and does everything you'll ever need. Sadly Google has decided it's not secure enough so they can force you onto Gmail app. This is just a Gmail con.

Excellent - BUT... The best email Android client I've found so far. BUT - GMAIL HAS BLOCKED access on K9. So are you going to fix this or not?? Please respond for all your long time users.

Used to be great Alot of great features. However it has issues with email syncing and it can drain your battery unexpectedly. There's no easy way to kill a sync job without force quitting the app, inherently the app should kill any sync attempt that takes an excessive amount of time but it doesn't.

Very bad star placement in message list The star is in the same place as the invisible scroll bar so 9 out of 10 times you'll hit the scroll bar instead of the star when you try. Otherwise, great software. Just not so good UI...

Eating my battery - no response...... 5 starts if issue is resolved. App keeps restarting in the background, lagging the phone and eating the battery. Pls solve this else I have to uninstal it. Experia Z1

Very configurable, but not Gmail friendly Really like app, can display msgs and headers exactly how you want to. Biggest problem is retrieving gmail headers is slow and hit n miss along with viewing emails often will not view. Has great search function, but yet again is not reliable when searching gmail databse.. Pls fix these problems. Can be 5 Star.

Do like but .... Data hungry I like K9 and wanted an email client for accounts separate from Gmail etc., but this service has used what I consider to be higher quantity of mobile data compared to other services. It's set to minimum demand but still too greedy, so regrettably will be removed for something more lightweight.

Good until used 1.2 gb of data in a day! I'd been using this for years, then 1 day it used 1.2gb of data! No idea why, no email attachment could ever be this big. Took me over my monthly data allowance. Very frustrating.

Great when it worked Has lots of great features but it continually stopped syncing so I wasn't receiving my mail. I managed to get it sync again only to have it quit again a day or two later. I finally got tired of it and uninstalled it.

No SPAM filters? Have used K-9 for a few days now. It's fast...Probably because it's a fairly light weight minimalist client. I have searched to no avail for a SPAM filter. I may have to abandon K-9 if that's not an option.