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K-9 Mail

Full-featured email client
E-mail client supporting multiple accounts, POP3, IMAP and Push IMAP. Can do
OpenPGP encryption if org.sufficientlysecure.keychain is installed. Settings
and account configurations can be exported so that they can be imported easily
if you are switching packages/signatures: a file manager will need to be already
installed to achieve this.

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Packages

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.

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  • Version 5.734 (27034) - Added on 2021-05-05

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • 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.
    • 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.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • 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.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.fsck.k9.permission.READ_MESSAGES
    • com.fsck.k9.permission.DELETE_MESSAGES
    • run foreground service
      Allows the app to make use of foreground services.

    Download APK 7.0 MiB PGP Signature | Build Log

  • Version 5.733 (27033) - Added on 2021-03-26

    This version requires Android 5.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • 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.
    • 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.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • 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.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • com.fsck.k9.permission.READ_MESSAGES
    • com.fsck.k9.permission.DELETE_MESSAGES
    • run foreground service
      Allows the app to make use of foreground services.

    Download APK 6.9 MiB PGP Signature | Build Log

  • Version 5.600 (26000) suggested Added on 2018-09-11

    This version requires Android 4.0.3 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • 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.
    • 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.
    • 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.
    • view network connections
      Allows the app to view information about network connections such as which networks exist and are connected.
    • 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.
    • control vibration
      Allows the app to control the vibrator.
    • prevent phone from sleeping
      Allows the app to prevent the phone from going to sleep.
    • modify or delete the contents of your shared storage
      Allows the app to write the contents of your shared storage.
    • com.fsck.k9.permission.REMOTE_CONTROL
    • com.fsck.k9.permission.READ_MESSAGES
    • com.fsck.k9.permission.DELETE_MESSAGES
    • read the contents of your shared storage
      Allows the app to read the contents of your shared storage.

    Download APK 4.6 MiB PGP Signature | Build Log