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.
   

   

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?)

   

4. On the Account type screen, tap IMAP.

   

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?)

   

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?)

   

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

   

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

   

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