What’s new
What's new:
- A Send crash reports setting in Settings > About > Diagnostics. It stays off unless you turn it on.
Fixed:
- While crash reports are off, the app sends no error reports at all.
Quick answer
Private email app with end-to-end encryption, aliases, and custom domains
Aster Mail is a private, encrypted email app for astermail.org accounts.
Your messages are encrypted on your device before they leave it. The server stores ciphertext and nothing else, so nobody at Aster can read your mail, scan it, or sell what is in it. There are no ads, no trackers, and no analytics anywhere in the app, and crash reports stay off unless you turn them on.
Private by design - End-to-end encryption between Aster users, using a post-quantum ratchet protocol - Zero-access architecture: the server holds only encrypted content - No ads, no tracking, and no profiling, with crash reports sent only if you turn them on - Open source under AGPL-3.0, so anyone can audit what the app does
Email aliases - Create an alias for each site you sign up for, and turn one off when it starts getting spam - See which alias a message arrived on, right in the message list - Import and export your aliases
Your own domain - Send and receive on a custom domain, with DKIM signing handled for you - Buy a domain from inside the app
Everyday mail - Folders, labels, categories, and search across your whole mailbox - Swipe actions and a toolbar you can customize - Templates, signatures, scheduled send, and auto-forwarding - Blocked senders, sender filters, and an allow list - Encrypted offline storage, so your mail is there without a connection
Security - Biometric lock - Two-factor authentication and a recovery key - Active session management, so you can sign out a device you no longer have
Notifications - Private mode hides the sender and subject on your lock screen - Quiet hours schedule when notifications arrive - Per-folder muting
This F-Droid build contains no Firebase or Google Play Services dependencies. Push notifications are delivered through any UnifiedPush-compatible distributor, such as ntfy. Background polling takes over when no distributor is installed.
Aster Mail is free to use. Paid plans add storage, larger attachments, more aliases, and custom domains.
Source code: https://github.com/Aster-Privacy/Aster-Android
Screenshots
How to install
- Download the APK from the button at the top of this page.
- Allow “Install unknown apps” for your browser or file manager only, not for every app.
- Open the downloaded file and confirm the installation.
- 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 Aster Mail: Encrypted Email?
Private email app with end-to-end encryption, aliases, and custom domains
Who develops Aster Mail: Encrypted Email?
Aster Mail: Encrypted Email is developed by Aster Communications Inc..
Which Android version does Aster Mail: Encrypted Email require?
Aster Mail: Encrypted Email requires Android API 26 or later.
What is the current version of Aster Mail: Encrypted Email?
The synchronized F-Droid version is 1.0.15.
Which license does Aster Mail: Encrypted Email use?
The signed F-Droid metadata lists AGPL-3.0-or-later.
Where is the source code for Aster Mail: Encrypted Email?
https://github.com/Aster-Privacy/Aster-Android
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