Battery hungry And oldfashioned. Needs polishing very much.
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!
Best email application for Android The UI might not be flashy but it is very efficient. Love the account color coding in unified inbox and "mark all as read" functionality. Account backup saves lot of time when I am migrating between devices. This little gem is one of the reasons why I am refusing to switch to iOS.
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.
Changes in v5.010:
• Fixed packaging error; v5.009 was missing translations in some cases
Changes in v5.009:
• Protect against the Surreptitious Sharing vulnerability
• Improved MIME type handling when other apps share files to K-9 Mail
One app to manage all your emails, files, contacts and more.