| K-9 Mail | |
|---|---|
 | |
| Original author | Jesse Vincent |
| Developers | MZLA Technologies Corporation, Christian Ketterer |
| Initial release | 27 October 2008; 17 years ago (2008-10-27) |
| Stable release | 13.0 / 26 December 2016; 5 January 2017; 31 December 2016; 4 April 2016; 4 April 2016; 9 February 2016; 29 November 2015; 9 June 2015; 30 April 2015; 13 March 2015; 13 March 2015; 17 December 2014; 10 October 2014; 25 September 2014; 21 June 2014; 27 January 2014; 17 January 2017; 24 February 2017; 15 March 2017; 13 April 2017; 28 August 2017; 27 December 2017; 3 January 2018; 4 January 2018; 6 January 2018; 2 September 2018; 24 July 2021; 17 April 2022; 26 July 2022; 28 November 2022; 11 May 2023; 12 October 2023; 29 February 2024; 11 March 2024; 5 April 2024; 10 May 2024; 7 June 2024; 10 December 2024; 25 June 2025; 6 May 2025; 6 March 2025; 20 August 2025; 15 July 2025; 6 November 2024; 30 October 2024; 2 September 2025; 3 September 2025; Error: first parameter cannot be parsed as a date or time. (26 December 2016; 5 January 2017; 31 December 2016; 4 April 2016; 4 April 2016; 9 February 2016; 29 November 2015; 9 June 2015; 30 April 2015; 13 March 2015; 13 March 2015; 17 December 2014; 10 October 2014; 25 September 2014; 21 June 2014; 27 January 2014; 17 January 2017; 24 February 2017; 15 March 2017; 13 April 2017; 28 August 2017; 27 December 2017; 3 January 2018; 4 January 2018; 6 January 2018; 2 September 2018; 24 July 2021; 17 April 2022; 26 July 2022; 28 November 2022; 11 May 2023; 12 October 2023; 29 February 2024; 11 March 2024; 5 April 2024; 10 May 2024; 7 June 2024; 10 December 2024; 25 June 2025; 6 May 2025; 6 March 2025; 20 August 2025; 15 July 2025; 6 November 2024; 30 October 2024; 2 September 2025; 3 September 2025) |
| Repository | |
| Written in | Java,Kotlin |
| Operating system | Android |
| Type | Email application |
| License | Apache License 2.0 |
| Website | k9mail |
K-9 Mail is afree and open sourceemail client forAndroid. It is designed as an alternative to the stock email clients included with the platform; it supports bothPOP3 andIMAP protocols and supportsIMAP IDLE for real-time notifications. The project is named after theDoctor Who characterK9.[1]
For end users, K-9 Mail started to transition towards becoming Thunderbird for Android in October 2024.[2][3]
The source code was first published to its git repository on October 27, 2008[4] byJesse Vincent and the first binaries were released to the public on the Google Code site the same month.[5]
In 2015 the project received $86,000 of funding from theOpen Technology Fund.[6]
On 13 June 2022, it was announced that K-9 Mail had been taken over byMZLA Technologies Corporation, a subsidiary of theMozilla Foundation with current maintainer Christian Ketterer joining the team, and plans for K-9 Mail to be rebranded asThunderbird for Android following the completion of a feature roadmap, including sync with Thunderbird on PC, integrating Thunderbird's automated account setup system, message filtering, and improvements to folders.[7]
On 30 October 2024, the first stable release of Thunderbird for Android (Thunderbird Mobile) was launched as version 8.0.[3] Thunderbird for Android can be installed viaGoogle Play andF-Droid, among others.[8] The Thunderbird team had planned in 2022 to maintain K-9 for one year after the release of Thunderbird Mobile, i.e. until roughly October 2025.[9]
On 6 May 2025, the stable version 10 of Thunderbird Mobile and the beta of version 11 were released.[10]
In the early 2010s it was widely reviewed, and was particularly praised in the media between 2011 and 2013 as a replacement for the default mail application.[11][12] At the time, it was a leading alternative Android app, often recommended[13] when a user did not want to use the default app. It was awarded the "Best App for Sending Email" in the 2010 "Best Android Apps" book.[14]
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