Aster Mail: Encrypted Email
Private email app with end-to-end encryption, aliases, and custom domains
Aster Communications Inc. Email
Screenshots
Description
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.
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, no telemetry, no profiling
- 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
What’s new (1.0.13)
This update improves how Aster Mail releases are built and verified. It has no visible changes.
Anti-features
Properties of this app that are worth knowing about before installing.
- NonFreeNet
Versions
Permissions
What the app asks the system for. Android only grants sensitive access after you confirm it.
- Internet accessSend and receive data over the internet.
- Network stateCheck whether and how the device is connected.
- NotificationsShow notifications.
- Run at startupStart automatically after the device is switched on.
- REQUEST_IGNORE_BATTERY_OPTIMIZATIONS
- Prevent sleepingKeep the device from going to sleep.
- Foreground serviceKeep running in the background, visible in the status bar.
- FOREGROUND_SERVICE_SPECIAL_USE
Show 9 more permissions
- Read contactsAccess the address book.
- Change contactsCreate and change address book entries.
- Sync settingsRead synchronisation settings.
- Change syncTurn synchronisation on and off.
- Write storageCreate and change files on the device storage.
- BiometricsUnlock with fingerprint or face.
- FingerprintUnlock with a fingerprint.
- android.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Read storageRead files on the device storage.
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