K9 Mail Gmail Authentication


K9 is a free, open-source email client that allows you to configure and access an email account on your smartphone or laptop/desktop. It’s easy to use and comes with some great features like a unified inbox, bug fixes, message list, and more. Even if this email client is compatible with almost all the email service providers, the “Authentication failed” message was displayed on the screen when I tried to configure my Gmail account with it. 

However, I managed to fix it by performing some basic troubleshooting solutions. If you’re also receiving the authentication failed message with Gmail, continue reading this page to know how to fix K9 Mail Gmail Authentication Failed.

Configuring the account settings correctly

In most cases, misconfigured account settings will lead to these problems. So, as the first step of troubleshooting the “authentication failed” problem, check whether your Gmail account settings, such as username, password, IMAP, and SMTP details, are entered correctly in the given fields. If not, enter them correctly.

Enabling IMAP

The Gmail service uses the IMAP settings to receive emails. So, when you face the authentication failed problem, check whether the IMAP setting is enabled on your Gmail account. If not, enable it and then try to access your account. Carry out the simple and quick instructions given below to check and enable the IMAP setting on your Gmail account. 

  • Step 1:From your computer browser, go to the Gmail account sign-in page.
  • Step 2:Sign in to your account.
  • Step 3:Now, click the Settings menu.
  • Step 4:Select See all Settings > Forwarding and POP/IMAP.
  • Step 5:Go to the section named “IMAP access.”
  • Step 6:Select the Enable IMAP option and click the Save Changes button.
  • Step 7:Now, try to configure your account.

Creating and using an app-specific password

If you see the “Gmail authentication failed” message again in K9, check whether you have enabled two-step verification on your account. If yes, then create and use an app-specific password for your account. To do so, follow the instructions below.

  • Step 1:Access your Google account.
  • Step 2:Click the Security option.
  • Step 3:Now, select the App Passwords option under the section named “Signing in to Google.”
  • Step 4:Follow the on-screen instructions.
  • Step 5:When prompted, select the K9 mail and the device type on which you wish to use the mail application.
  • Step 6:Create the app-specific password and enter it in the given field.
  • Step 7:Finally, click the Done button.

Now, try to configure the Gmail account in K9. When prompted, type the app-specific password in the given field.

Contact us if none of the solutions fix the K9 Mail Gmail Authentication Failed. 

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