I am a BlackBerry covert to Android and I can say that BlackBerry had the best email functionality of all phones, Android is just a joke in comparison, but I digress.
Now, when I was forced to migrate due to BlackBerry shutdown in Jan 2022 I tested many apps on Android: Outlook, Bluemail, Aquamail, Gmail, etc, etc. And they all were cr@p - display huge ads, steal user info, look ugly, or just clunky UI and annoying to work with.
I now use K-9 Mail (what a name!) because it’s more or less clean UI, doesn’t have ads and is based on open source. There is still long ways to go to meet BlackBerry level, like when push doesn’t drain battery and you don’t have to worry and manually refresh to make sure there are no new emails that sync didn’t get.
I am super excited to hear that Thunderbird took K9 Mail under it’s wing and I hope that it will bring additional firepower in terms of developer involvement, fixing push so that it works seamlessly and improve that ugly 3.2 star user rating on Google play. Also I hope this will help to fight against Google when important features need to be reviewed, I’m sure Google will be more willing to review&approve code when Mozilla asks for it, rather than someone from K-9. Best of luck to the team!!!
With regards to traditional users of K-9 Mail, I’m sure some of you are unhappy, like I was unhappy about BlackBerry shutdown it’s servers, otherwise I would still be using it. But let’s face it, prime time of K-9 mail was over, user rating is down, it doesn’t even show up when you type “Mail” in Play store, you have to search for it. It was the underdog of mail apps. There needs to be a “reboot” to bring K9 back to the stage, so it can compete with Outlook, Gmail and the like. And I hope that Thunderbird will give those powers to K9.
User input oftentimes leads to more useless features and more bloat. I hope that doesn’t happen to K9, like that they don’t try to now manage calendar and contacts which Android already does, and just focus on email app. But worst case you can always manually install .APK of your favourite version (which doesn’t update) and use it forever until the end of time.