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


Starting February 15, 2021, G Suite accounts will only allow access to IMAP accounts using OAuth. Password-based access will no longer be supported by Google.

Beginning June 15th, 2020, users who try to connect via "Less Secure Apps" (LSA) for the first time will no longer be able to do so. Users who have connected to LSAs prior to this date will be able to continue using them until usage of all LSAs is turned off on February 15, 2021.

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 Gmail 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 > Security > Passwords > Saved Passwords and click the "Show Passwords" button.
  2. Take a screenshot of your passwords, so you have them as a backup.
  3. Remove all of your Gmail passwords from the Password Manager, then close the window.
  4. Navigate to Options | Preferences > Accounts. Select the first Gmail account and change Authentication to "OAuth2." Repeat this step for each of your Gmail accounts.
  5. Next Navigate to Options | Preferences > Accounts > Outgoing Servers. Here you will want to edit each Gmail server and change Authentication to "OAuth2."
  6. Once complete, restart Postbox, and it will authenticate with each of your Gmail accounts. Follow the onscreen prompts and you're all set! 

Happy Emailing!

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