Mozilla launches email for Android devices

Mozilla launches email for Android devices

Mozilla Foundation has unveiled Thunderbird-style email client for Android mobile devices called K-9 Mobile. The developer team is also evaluating the idea of an iOS version.

Credit: Dreamstime

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.

Follow Us

Join the newsletter!


Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Androidmozilla



Join key decision-makers within Environmental, Social, and Governance (ESG) that have the power to affect real change and drive sustainable practices. SustainTech will bridge the gap between ambition and tangible action, promoting strategies that attendees can use in their day-to-day operations within their business.

EDGE 2023

EDGE is the leading technology conference for business leaders in Australia and New Zealand, built on the foundations of collaboration, education and advancement.


ARN has celebrated gender diversity and recognised female excellence across the Australian tech channel since first launching WIICTA in 2012, acknowledging the achievements of a talented group of female front runners who have become influential figures across the local industry.

ARN Innovation Awards 2023

Innovation Awards is the market-leading awards program for celebrating ecosystem innovation and excellence across the technology sector in Australia.

Show Comments