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Gridlink Mail

A fast, private JMAP and IMAP email client. No ads, no tracking, no Google.
New in version 1.0.0
Gridlink Mail 1.0.0. The interface is finished; this is the release it was heading for.

- Reading: choose whether opening a message marks it read, or leave that to the swipe and the button.
- Filters can now ask about more than one thing at a time, and act on more than one.
- Mail tags are read from the server itself, so tags made in another client show up here.
- Contacts read as facts, not as a form nobody can type in, and can be deleted from the edit screen.
- Calendar: tapping a day takes t
Gridlink Mail is an email client built for JMAP, the modern successor to IMAP. It syncs faster, uses less battery and less data, and was designed for phones rather than adapted to them. It speaks classic IMAP and SMTP too, so it works with any standard mail provider.

There is no Gridlink account and no Gridlink server. The app talks only to the mail server you configure. It collects nothing, contains no ads, no tracking and no Google libraries, and it is free software under the GPLv3.

Features

* JMAP mail, with IMAP/SMTP as a fully supported alternative
* Contacts and calendar over JMAP, with CardDAV and CalDAV fallback
* Autodiscovery: type your address and let it find the server, or pick the protocol yourself
* Remote images blocked by default, so a message cannot phone home unless you let it
* OpenPGP support
* Self-hosted friendly, including servers using a self-signed certificate
* Two-pane layout on unfolded and tablet-sized screens
* Swipe actions, undo send, scheduled send and threaded conversations

A note on this build

Gridlink Mail is a fork of Sterna Mail by emon (https://codeberg.org/emon/sterna-mail), reused under the GPLv3. The mail engine, sync layer and OpenPGP support are emon's work; this fork rebuilds the front end and the setup flow. It is not an official Sterna release and emon does not support it. If you want the original, upstream is the better-tested and actively maintained app.
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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
  • Version 1.0.0 (1001) suggested Added on Sep 20, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 8.0 or newer.

    It is built and signed by the original developer, and guaranteed to correspond to this source tarball.

    Permissions
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "specialUse"
      Allows the app to make use of foreground services with the type "specialUse"
    • have full network access
      Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.
    • show notifications
      Allows the app to show notifications
    • Read calendar events and details
      This app can read all calendar events stored on your phone and share or save your calendar data.
    • read your contacts
      Allows the app to read data about your contacts stored on your phone. Apps will also have access to the accounts on your phone that have created contacts. This may include accounts created by apps you have installed. This permission allows apps to save your contact data, and malicious apps may share contact data without your knowledge.
    • read sync settings
      Allows the app to read the sync settings for an account. For example, this can determine whether the People app is synced with an account.
    • run at startup
      Allows the app to have itself started as soon as the system has finished booting. This can make it take longer to start the phone and allow the app to slow down the overall phone by always running.
    • use biometric hardware
      Allows the app to use biometric hardware for authentication
    • use fingerprint hardware
      Allows the app to use fingerprint hardware for authentication
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • add or modify calendar events and send email to guests without owners' knowledge
      This app can add, remove, or change calendar events on your phone. This app can send messages that may appear to come from calendar owners, or change events without notifying their owners.
    • modify your contacts
      Allows the app to modify the data about your contacts stored on your phone. This permission allows apps to delete contact data.
    • toggle sync on and off
      Allows an app to modify the sync settings for an account. For example, this can be used to enable sync of the People app with an account.
    • app.gridlink.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 5.9 MiB PGP Signature | Build Log

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