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Sterna Mail

emon
Internet
Version
1.6.5
Size
6.9 MB
Requires
Android API 26+
4.5 / 5 · 3,309 ratings 21,251 downloads
Download APK

Updated Oct 5, 2026

Quick answer

Private email client for JMAP and IMAP/SMTP. No Google services, no tracking.

Sterna Mail is a free, private email client for Android. It is built for JMAP, the modern successor to IMAP, and works just as well with any IMAP/SMTP provider.

No tracking, no ads, no Google services. The code is GPLv3, and F-Droid checks that the app it ships is byte for byte the one built from the published source.

Reading: * Several accounts, JMAP and IMAP side by side, with a unified inbox that works offline * Conversations, search as you type and snooze

Writing: * Several identities, each with its own signature * Undo send and scheduled send

Privacy and security: * OpenPGP encryption through an app such as OpenKeychain * Remote images and tracking pixels blocked by default, app lock with fingerprint or PIN

Setup and notifications: * Setup from your email address alone, or a manual form when the domain publishes nothing * Push notifications without Google, over JMAP, IMAP IDLE or UnifiedPush * Available in eleven languages

Screenshots

Sterna Mail screenshot 1
Sterna Mail screenshot 2
Sterna Mail screenshot 3
Sterna Mail screenshot 4
Sterna Mail screenshot 5
Sterna Mail screenshot 6
Sterna Mail screenshot 7
Sterna Mail screenshot 8

What’s new

JMAP labels show on messages and can be set or cleared from the open message.

A strip warns when your server, if Sterna recognises it, reported the sender's authentication as failed.

Stalwart 1.0: OAuth sign-in through the browser, and push no longer loses the sign-in.

List: sender's address after the name when it fits. Composer: "Remove quoted text". Copyable subject, "Unread" app shortcut, Material You launch screen, right-to-left text fixes.

How to install

  1. Download the APK from the button at the top of this page.
  2. Allow “Install unknown apps” for your browser or file manager only, not for every app.
  3. Open the downloaded file and confirm the installation.
  4. If installation fails with “App not installed,” remove an earlier build of the same app first. A signature conflict is the usual cause.

Data safety

  • Every file is checked against its published SHA-256 before it is listed.
  • Files are scanned for malware on every update.
  • The permissions each app requests are listed on its own page.
  • Read the full safety policy for how we test, flag, and delist files.

Frequently asked questions

What is Sterna Mail?
Private email client for JMAP and IMAP/SMTP. No Google services, no tracking.
Who develops Sterna Mail?
Sterna Mail is developed by emon.
Which Android version does Sterna Mail require?
Sterna Mail requires Android API 26 or later.
What is the current version of Sterna Mail?
The synchronized F-Droid version is 1.6.4.
Which license does Sterna Mail use?
The signed F-Droid metadata lists GPL-3.0-or-later.
Where is the source code for Sterna Mail?
https://codeberg.org/emon/sterna-mail

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