Sterna Mail
- Adding an account now starts from your address: Sterna looks for the settings your mail domain publishes, instead of asking you for them. The manual form is still there when nothing is published.
- A JMAP account can sign in through your browser when its server asks for that, with a PKCE proof. The manual form stays reachable when the server hands sign-in over to the browser.
Reading
- Messages can be opened as plain text instead of their HTML. There is a switch in Setting
It is private by default, pleasant to use, and fully free software (GPLv3). No tracking, no ads, no analytics, and no Google services required.
Reading and organising:
* Unified inbox across multiple accounts (JMAP and/or IMAP/SMTP), fully offline with a local cache
* Multiple JMAP accounts under a single login (delegated, shared or team mailboxes), each with its own folders, notifications and Sent copies
* Conversation threading, nested folders, configurable swipe actions, stars, archive and delete with undo
* Multi-select bulk actions, snooze, report spam, sort and unread-only filter
* Search as you type, combining instant local results with server-side search, plus filters for sender, subject, attachments and date
* Calendar invitations preview as an event card and go into your calendar app in one tap
Writing and sending:
* Compose with recipient autocomplete, multiple identities each with its own signature, attachments and drafts
* Replies come from the address the message was sent to, with that identity's signature
* Undo send, schedule send, and reminders for a forgotten attachment or a large recipient list
* Opens mailto: links from any app or browser, prefilled
Accounts, notifications and encryption:
* Add an account with just your email and password (autodiscovery), password-free OAuth 2.0 sign-in, or manual IMAP/SMTP setup with provider presets
* Push notifications for new mail with no Google and no FCM, over JMAP EventSource, IMAP IDLE or UnifiedPush, grouped per account and with quiet hours
* OpenPGP encryption through OpenKeychain, on both JMAP and IMAP/SMTP. Decrypted content is never written to disk; an attachment you open is written to the app's own storage until the cache is cleared
* Remote images and tracking pixels blocked by default, and tracking parameters can be stripped from links before they open
* Credentials encrypted with the Android KeyStore, app lock with biometrics or a PIN
Server features and polish:
* Server-side vacation responder, Sieve filter rules, and mailbox quota display
* Material 3 interface with its own light and dark themes, optional Material You, and adjustable message text size
* Available in nine languages: English, French, German, Spanish, Italian, Portuguese, Dutch, Polish and Russian
* Screen-reader friendly, with settings export and import
Sterna Mail is open source, and its release builds are reproducible: F-Droid checks that the app it distributes is byte for byte the one built from the published source. The code can be read, audited, and improved by anyone.
- Author: emon
- License: GNU General Public License v3.0 or later
- Issue Tracker
- Source Code
- Build Metadata
- Reproducibility Status
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Versions
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.
Download F-Droid-
arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 4.2 MiB PGP Signature | Build Log
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arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 4 MiB PGP Signature | Build Log
-
arm64-v8aarmeabi-v7ax86x86_64This version requires Android 8.0 or newer.
It is built and signed by the original developer, and guaranteed to correspond to this source tarball.
Download APK 4.0 MiB PGP Signature | Build Log
- Before emptying a folder or destroying mail, Sterna asks the server where those messages are now, and leaves out anything that has moved in the meantime (JMAP). When the answer does not come, it gives up rather than guessing.
- On IMAP, a delete that cannot confirm the server's message numbering is refused instead of risked, so it cannot fall on the wrong message.
- Accounts with hundreds of folders no longer run into a database limit when cached folders are purged.
- Bulk actio
- During a search, Select all now takes the results on screen instead of the whole folder. Filtering, selecting all and deleting no longer empties the folder.
- With the unread filter on, Select all takes the unread messages, not the read ones behind them.
- Snoozed messages are no longer selected: they are not on screen.
Reading
- A message you send to yourself now reads by its sender in the Inbox, in the list, inside an unfolded conversation, and in the reader. Sent, Drafts a