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Download Thunderbird Beta for Testers (f-droid version) 6.400 APK
Supports installation on external storage.
Target: Android 12 (API 31)
What's new in Thunderbird Beta for Testers (f-droid version) 6.400
- Increased timeout when sending messages because some users have reported problems with sending large attachments
- Allow all URI schemes in HTML links
- Fixed display bug with search in general settings
- When composing messages don't hide Cc and Bcc fields if they contain incomplete email addresses
About Thunderbird Beta for Testers (f-droid version) 6.400
K-9 Mail is an open source email client that works with basically every email provider.
Premium
Features
* supports multiple accounts
* Unified Inbox
* privacy-friendly (no tracking whatsoever, only connects to your email provider)
* automatic background synchronization or push notifications
* local and server-side search
* OpenPGP email encryption (PGP/MIME)
Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt your emails using OpenPGP.
Support
If you're having trouble with K-9 Mail, ask for help in our support forum at forum.k9mail.app
Want to help?
K-9 Mail is a community developed project. If you're interested in helping to improve the app, please join us! You can find our bug tracker, source code, and wiki at github.com/k9mail/k-9
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Thunderbird Beta for Testers (f-droid version) 6.400 variants
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:6.400
Uploaded:November 29, 2022 at 6:07AM UTC
File size:7.61 MB
Downloads:223
Version:21.0
Uploaded:July 21, 2026 at 2:21PM UTC
File size:10.67 MB
Version:6.804(38004) for Android 5.0+ (Lollipop, API 21)
Uploaded:June 15, 2024 at 7:56PM UTC
File size:9.75 MB
Downloads:150
Version:6.803(38003) for Android 5.0+ (Lollipop, API 21)
Uploaded:May 15, 2024 at 1:03AM UTC
File size:9.74 MB
Downloads:55
Version:6.802(38002) for Android 5.0+ (Lollipop, API 21)
Uploaded:May 14, 2024 at 6:59PM UTC
File size:9.71 MB
Downloads:22
Version:6.400(34000) for Android 5.0+ (Lollipop, API 21)
Uploaded:December 15, 2022 at 6:05AM UTC
File size:7.60 MB
Downloads:113
Version:6.312(33012) for Android 5.0+ (Lollipop, API 21)
Uploaded:November 17, 2022 at 3:23AM UTC
File size:7.60 MB
Downloads:85
Version:6.202(32002) for Android 5.0+ (Lollipop, API 21)
Uploaded:November 15, 2022 at 11:53PM UTC
File size:7.73 MB
Downloads:24
Version:6.200(32000) for Android 5.0+ (Lollipop, API 21)
Uploaded:July 13, 2022 at 7:30AM UTC
File size:7.72 MB
Downloads:29
Version:21.0
Uploaded:July 23, 2026 at 6:28PM UTC
File size:10.19 MB
Downloads:2
Version:20.1
Uploaded:July 9, 2026 at 10:32AM UTC
File size:10.11 MB
Downloads:9
Version:20.0
Uploaded:June 24, 2026 at 1:10PM UTC
File size:10.11 MB
Downloads:12
Version:19.2
Uploaded:June 6, 2026 at 9:31AM UTC
File size:10.09 MB
Downloads:19
Version:19.1
Uploaded:June 5, 2026 at 2:19PM UTC
File size:9.57 MB
Downloads:2
Version:19.0
Uploaded:May 29, 2026 at 3:19PM UTC
File size:9.57 MB
Downloads:6
Version:18.0
Uploaded:April 17, 2026 at 5:46PM UTC
File size:9.48 MB
Downloads:6
Version:17.0
Uploaded:March 20, 2026 at 8:52PM UTC
File size:13.38 MB
Downloads:11
Version:16.1
Uploaded:March 3, 2026 at 10:56PM UTC
File size:12.76 MB
Downloads:14
Version:16.0
Uploaded:February 7, 2026 at 10:32AM UTC
File size:12.76 MB
Downloads:18
