

The development of an Android email client from the ground up was one of the options that the team discussed, but it would have been a large project that would have required considerable effort and resources. The Android version enables Thunderbird users to sync data between desktop versions and their mobile Android devices. The release would fill a gap, as Thunderbird has been available for desktop operating systems only up until now. Thunderbird product and business development manager Ryan Lee Sipes confirmed in May 2022 that Thunderbird would become available for Android soon. K-9 Mail now requires Android 5.The developers of the open source Thunderbird email client confirmed today that the open source Android email app K-9 Mail will become Thunderbird for Android.Deprecated support for the WebDAV protocol new accounts can no longer be added.Changed periodic background sync and push implementations to work much more reliably.Here's the full changelog for the K-9 Mail v5.8 However, the developer says this won't affect existing WebDAV accounts, and they will continue to work for now. It's also ending support for WebDAV accounts.

The new version now requires Android 5.0 and above. The K-9 Mail v5.8 is rolling out on the Google Play Store, and it brings some much-needed improvements to this OG email client, including a redesigned interface, improved background sync, better image previews for image attachments, improvements to Unified Inbox and end-to-end encryption, and various bug fixes.
