Setting up K-9 Mail

The instructions and screenshots in this setup guide are for the K-9 Mail app, which is an open source email client for Android.

You can easily add your Fastmail account to K-9 Mail using the setup guide in the Settings → Import & Setup screen. The general setup instructions are below.

K-9 Mail needs its own app password to access your information. If you use your normal password or your Fastmail two step verification password in K-9 Mail, syncing won't work and you will see a password error.

  1. Open the K-9 Mail app.
  2. If you don't already have an account set up, the Welcome to K-9 Mail screen appears. Tap on Next to go to the next page. Otherwise, open the app's menu, scroll down to Settings, and then tap Add Account.

    k9-settings.png

  3. On the Set up a new account screen, fill in your email address and tap Next, then enter your app password. When you're ready, tap Manual setup.

    • Email address: Your full Fastmail username, including the domain.
    • Password: Your K-9 Mail app password. (What is an app password?)

    k9-setupanewaccount.png

  4. On the Account type screen, tap IMAP.

    k9-imap.png

  5. Enter the server settings for incoming email. When you're ready, tap Next.

    • IMAP Server: imap.fastmail.com
    • Security: SSL/TLS
    • Port: 993
    • Auto-detect IMAP namespace: (leave ticked)
    • IMAP path prefix: (leave blank)
    • The Username and Password fields should be filled in. The password is your app password. (What is an app password?)

    k9-incoming.png

  6. Enter the server settings for outgoing email. When you're ready, tap Next.

    • SMTP Server: smtp.fastmail.com
    • Security: SSL/TLS
    • Port: 465
    • Require sign-in: (leave ticked)
    • Authentication: Normal Password.
    • The Username and Password fields should be filled in. The password is your app password. (What is an app password?)

    k9-outgoing.png

  7. Choose your synchronization and notification settings. Tap Next.

    k9-accountoptions.png

  8. Enter the account name and your display name, then tap Done.

    k9-accountname.png

The K-9 app will now fetch your folders and start synchronizing your mail!

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