Using FastMail with K9 Mail

What you need to know

K9 Mail is an open sourced email client for Android. It is based on the Email application shipped with the initial release of Android. It supports multi folder sync.

K9 Mail is freely downloadable on the Android Market.

Note: If you already know how to set up your client, and you already understand the information below, see this help page for the server information you need to set up your e-mail client. The Troubleshooting Issues section at the bottom of this page may be helpful if you have problems.

In order to use k9mail with FastMail, you'll need to enter the following information:

  • username - When you signed up for FastMail, you chose a username which is also your e-mail address. You must use the full username, including the name and the domain part, which is the part after the '@' symbol. For example, a user named John Doe might have chosen a username of "johndoe@fastmail.fm". Make sure that you specify your username in lowercase only.
  • password - When you signed up for FastMail, you chose a password to go along with your username. You will need the password to access your account. The password also keeps others from being able to access your e-mail. Your password is case sensitive, so be sure that you type it in correctly. "PASS123" is different to  "pass123". Often, users forget about the CapsLock button and mistype their password.
  • incoming mail server (IMAP or POP) - This is the server that you get your e-mail from. Internet Message Access Protocol (IMAP) and Post Office Protocol (POP) are retrieval methods used to move e-mail messages from the server to your e-mail client so that you can read your messages. POP access is not available for all service levels, please check the pricing table for details. Secure Sockets Layer (SSL) is required for your protection as well. SSL keeps people from reading your e-mail as it is transmitted between the e-mail server and your computer.
  • outgoing mail server (SMTP) - This is the server that sends your e-mail. Simple Mail Transfer Protocol (SMTP) is the method that your client uses to move e-mail messages from your client to the server so that it can send your messages. The FastMail SMTP server is not available for all service levels, please check the pricing table for details. If your service level does not allow use of the FastMail SMTP server, you must use the SMTP server provided by your Internet Service Provider (ISP).

    The FastMail SMTP server requires SMTP Authentication. This keeps people who are not users of the FastMail service from using the SMTP server to send spam messages on the Internet. SSL is required for the FastMail SMTP server. If you don't use the FastMail SMTP server, you may have different options or requirements. You will need to get that information from your ISP.

Incoming/Outgoing Server Setup

  1. First Time Startup

    When you run K9 for the first time, it would give you a list of its existing features.

    Click on Next to start the setup.



  2. Existing Accounts

    If there are existing accounts, choose Add Account from the Menu.

  3. Account Information

    Enter your full fastmail username.
    Enter your fastmail password.

    Click on Manual Setup.

  4. Type of Account

    Choose IMAP.

  5. Incoming Server Settings

    Username: Enter your full fastmail username.
    Password: Enter your fastmail password.
    IMAP Server: mail.messagingengine.com
    Security type: SSL (always)
    Authentication type: PLAIN
    Port: 993

    Click on Next.

  6. Validation

    Wait until the checking is complete

  7. Outgoing Server Settings

    SMTP Server: mail.messagingengine.com
    Security type: SSL (always)
    Port: 465
    Enable Require sign-in
    Authentication type: PLAIN
    Username: Enter your full fastmail username.
    Password: Enter your fastmail password.

    Click on Next.

  8. Validation

    Wait until the checking is complete

  9. Account Options

    Choose the desired values and click on Next.



  10. Complete Setup

    Set your "Full Name" and click on Done to complete setup.



    Click on your account to access your fastmail Inbox



  11. Set your "Sent Items" and "Spam" folders

    From the Menu, go to More -> Settings -> Account Settings



    Click on Fetching mail



    Choose folders as shown in the screenshot below

    Click on Next and wait for the validation to complete.



  12. Your account should now be fully setup with K9 Mail

    For details on how to manage your folders on K9, please refer to this page

    Last modified on: Sat Dec 4 2010