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Mozilla has announced a new email client for Android devices called K-9 Mail. The new mobile app is being launched as part of Mozilla’s Thunderbird family of open source desktop email and chat applications.
The Mozilla Foundation said it is also currently evaluating the development of a K-9 email client for iOS devices.
K-9 Mail includes an improved account setup using Thunderbird account auto-configuration, improved folder management, support for message filters, and synchronisation between desktop and mobile versions of Thunderbird, Mozilla said. K-9 Mail is available for download through these various sites.
“Ultimately, K-9 Mail will transform into Thunderbird on Android, once certain development milestones have been achieved which align it closely with Thunderbird's feature set and visual appearance,” K-9 Mail Project Maintainer Christian Ketterer said in a blog post. Ketterer is better known in the Mozilla open-source developer community as cketti.
Thunderbird is a free and open-source email, calendaring, newsfeed, and chat client with more than 20 million active monthly users across Windows, macOS, and Linux. Like Thunderbird, the K-9 Mail project is entirely funded by the Mozilla Foundation community of open source developers.
Currently, Android mobile users have a number of email and chat options, including Google’s Gmail, Microsoft Outlook and ProtonMail, an end-to-end encrypted email service.
Ryan Lee Sipes, Thunderbird Product Manager, said working with the Thunderbird email team to develop the new mobile client made more sense than developing a mobile client from scratch.
“Joining the Thunderbird family allows K-9 to become more sustainable and gives us the resources to implement long-requested features and fixes that our users want," Sipes said. "In other words, K-9 Mail will soar to greater heights with the help of Thunderbird.”
Mozilla plans to offer Firefox Sync as one option to allow users to securely sync accounts between Thunderbird and K-9. The feature is expected to be implemented in the summer of 2023. K-9 will have a similar look and feel to Thunderbird’s current desktop app, with the exception of certain functions.
Thunderbird for Android initially will not support calendars, tasks, feeds, or chat like the desktop app, cketti wrote in a QA included as part of his blog post. Ketterer said the developer team is first working on “an amazing email experience,” and is considering the best way to provide Thunderbird’s other functionality on Android. “But currently [we] are still debating how best to achieve that.”
For instance, he wrote, one method to be able to use Thunderbird’s desktop email feature set is to simply sync calendars, and then users can use their preferred calendar application on their device.
“But we have to discuss this within the team, and the Thunderbird and K-9 communities, then decide what the best approach is,” Ketterer wrote.
