Private, modern Android email client for JMAP — with full IMAP/SMTP support.
About this app
Sterna Mail is a private, modern email client for Android, built for JMAP — the faster successor to IMAP — with full support for classic IMAP/SMTP too. You pick the protocol when you add an account, so Sterna Mail works with JMAP servers like Stalwart as well as any standard mail provider.
It is private by default, pleasant to use, and fully free software (GPLv3). No tracking, no ads, no analytics, and no Google services required.
Features:
* Built for JMAP — faster sync, less battery and data — plus full IMAP/SMTP * Multiple accounts (JMAP and/or IMAP/SMTP) with a unified inbox * Push notifications for new mail without Google services (JMAP push, IMAP IDLE) * Read, organise, and search your mail — works offline with a local cache * Conversation threading, configurable swipe actions, folders, flags, archive * Write, reply, forward, and send — with attachments, drafts, and signatures * Undo send (a brief hold-back window) and schedule send for later * Folder management and report-spam * Privacy by default: remote images and tracking pixels blocked * Biometric app lock * Material 3 interface that follows your system light/dark theme
Sterna Mail is open source. The code can be read, audited, and improved by anyone.
Licensed under GPL-3.0-or-later, by emon.
What's New in v1.1.4
Imported from the F-Droid repository index.
- Technical release: removes environment-dependent metadata from the APK, completing byte-for-byte reproducible builds for F-Droid verification. No functional changes.
Version history
Jul 10, 2026 · 3.5 MB · Android API 26–36 · code 131
Imported from the F-Droid repository index.
- Technical release: removes environment-dependent metadata from the APK, completing byte-for-byte reproducible builds for F-Droid verification. No functional changes.
SHA-256 f327acd5a91dbd90a891637bc1652c398255a58b413cb24fdac02f44f618aebd
Will it run on your device?
92%
- Runs on a broad range of modern Android versions.
- Multiple CPU architectures are covered.
- Aligned with the latest Android target SDK expectations.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
Before you install anything, confirm the file is the one described here. On a computer, run shasum -a 256 your-download.apk (macOS or Linux) or certutil -hashfile your-download.apk SHA256 (Windows), then compare the output character-for-character with the SHA-256 on this page. If a single character differs, the file is not the build we recorded — delete it.
What the signing certificate proves
Every Android app is signed with a private key that only its developer holds. The fingerprint on this page is a hash of the matching public certificate, and it proves continuity rather than identity: it tells you a build came from whoever signed the earlier ones. Android enforces this at install time — if a package claiming to be app.sterna is signed with a different key, the system will refuse to install it over your existing copy. A fingerprint that changes between releases is worth pausing on, because a repackaged app that has been modified by someone else cannot keep the original signature.
How to roll back to an earlier version
No earlier build is on record for Sterna Mail, so there is nothing to roll back to yet. When a second version is published, this section will explain how to move between them safely.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Sterna Mail, and a listing is removed when the evidence for it stops holding up.
Get Sterna Mail
Every source we list for app.sterna is legality-reviewed. Pirated or cracked builds are never offered.
Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
f327acd5a91dbd90a891637bc1652c398255a58b413cb24fdac02f44f618aebd
Signing certificate
cf2d007f7bfa44e08e20943de4fe17fb0873707fd759d6db9cadb1f4b2aaedc4
Permissions Required
What each permission lets Sterna Mail do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
No earlier build is on record — this is the first release we have listed.
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
More Social apps
More from F-Droid
Report a problem with this listing
A listing is only as good as its corrections. If a source is broken, a signature looks wrong, or this app should not be here, tell the moderation team.