How to Upgrade to OAuth2 Security for Existing Google/Gmail Accounts


Starting June 2022, Google/Gmail/G Suite accounts will only allow access to IMAP accounts using OAuth. Password-based access is no longer supported by Google.

Gmail IMAP and SMTP servers support authorization via the OAuth 2.0 protocol, which Postbox also supports. If you're receiving notifications about using a less secure application, or simply want to use the latest and greatest security protocol, try upgrading your Postbox Gmail account to OAuth2. It's quick and easy to do!

Note: These instructions are only for Google/Gmail/G Suite accounts that have already been set up within Postbox. If you are setting up a new Gmail account, simply walk through our New Account Wizard and the correct settings will be configured for you.

  1. Within Postbox, navigate to Options | Preferences > Privacy and then select the checkbox for "Accept cookies from sites." 
  2. Navigate to Options | Preferences > Security > Passwords > Saved Passwords and click the "Show Passwords" button. Take a screenshot of your passwords, so you have them as a backup. Remove all of your Gmail passwords from the Password Manager, then close the window.
  3. Navigate to Options | Preferences > Accounts. Select the Gmail account and change Authentication to "OAuth2 (Google)." Repeat this step for each of your Gmail accounts.
  4. Navigate to Options | Preferences > Accounts > Outgoing Servers. Here you will want to edit each Gmail server and change Authentication to "OAuth2 (Google)."
  5. Once complete, restart Postbox, and it will authenticate with each of your Gmail accounts. 
  6. IMPORTANT! - If using 2-Step Verification, please note that Postbox does not support authentication using the YouTube app. When you reach the 2-Step Verification screen, scroll down and click on the Try another way link, then select either text messaging or the Authenticator app.

Happy Emailing!

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