What's new in K-9 Mail 18.0
K-9 Mail version 18.0
New:
- PNG avatars
- Setting to display ISO date/time in message list
- Fixed-width font for composing
Changed:
- Attachment summary moved to header
Fixed:
- "Delete (from notification)" setting did not retain state
- Find folder search hint text was cut off
- User not notified if offline when sending message
- CC/BCC fields were not expanded by default for Reply All
- Crash occurred when retrieving images
- Deleted messages could remain visible in message list
About K-9 Mail 18.0
K-9 Mail is an open source email client that works with basically every email provider.
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 now part of the Thunderbird family and remains 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/thunderbird/thunderbird-android
We're always happy to welcome new developers, designers, documenters, translators, bug triagers and friends.
Download K-9 Mail 18.0
This release may come in several variants. Consult our handy FAQ to see which download is right for you.
Version:18.0
Uploaded:April 17, 2026 at 5:46PM UTC
File size:9.48 MB
Downloads:2
Version:18.0
Uploaded:April 17, 2026 at 5:46PM UTC
File size:9.48 MB
Version:18.0
Uploaded:April 19, 2026 at 4:14PM UTC
File size:9.94 MB
Downloads:15
Version:17.0
Uploaded:March 24, 2026 at 1:32PM UTC
File size:14.01 MB
Downloads:52
Version:16.1
Uploaded:February 28, 2026 at 6:54PM UTC
File size:13.36 MB
Downloads:85
Version:16.0
Uploaded:February 3, 2026 at 6:14PM UTC
File size:13.36 MB
Downloads:86
Version:15.0
Uploaded:January 12, 2026 at 3:40PM UTC
File size:13.29 MB
Downloads:57
Version:14.0
Uploaded:December 20, 2025 at 7:58AM UTC
File size:12.93 MB
Downloads:98
Version:13.0
Uploaded:October 21, 2025 at 8:56PM UTC
File size:12.34 MB
Downloads:130
Version:12.1
Uploaded:September 9, 2025 at 5:44AM UTC
File size:12.20 MB
Downloads:63
Version:11.1
Uploaded:August 27, 2025 at 9:24AM UTC
File size:11.43 MB
Downloads:137
Version:11.0
Uploaded:July 16, 2025 at 5:42AM UTC
File size:11.43 MB
Downloads:67






































