Can't add gmail account to mac mail error 400

Frustrating!

Error 400 when trying to add a Gmail account to Mac Mail is usually due to a misconfiguration or a temporary issue. Here are some troubleshooting steps to help you resolve the issue:

  1. Check your Gmail account settings:
    • Ensure that your Gmail account is set up correctly and you're using the correct login credentials.
    • Make sure that IMAP is enabled for your Gmail account. You can do this by going to your Gmail settings (gear icon) > Forwarding and POP/IMAP > Enable IMAP.
  2. Check your Mac Mail settings:
    • Ensure that you're using the correct email address and password for your Gmail account.
    • Check that the "Use SSL" option is enabled under "Account Information" > "Account Type" in Mac Mail.
  3. Try resetting your Gmail password:
    • If you've recently changed your Gmail password, try resetting it to see if that resolves the issue.
  4. Check for any firewall or antivirus software issues:
    • Ensure that your firewall and antivirus software are not blocking the connection to Gmail.
  5. Try deleting and re-adding the account:
    • Go to Mac Mail > Preferences > Accounts > Select your Gmail account > Click the minus (-) button to delete the account.
    • Then, go back to Mac Mail > Preferences > Accounts > Click the "+" button to add a new account.
    • Enter your Gmail account credentials and follow the setup process.
  6. Check for any conflicts with other email accounts:
    • If you have multiple email accounts set up in Mac Mail, try removing any other accounts and then re-adding your Gmail account.
  7. Try using a different email client:
    • If you're still having issues, try using a different email client, such as Mozilla Thunderbird or Microsoft Outlook, to see if the issue is specific to Mac Mail.
  8. Reset your Mac Mail preferences:
    • Go to Mac Mail > Preferences > Reset > Reset Mailbox Data.
    • This will reset your Mac Mail preferences to their default settings.
  9. Contact Google support:
    • If none of the above steps resolve the issue, you may want to contact Google support to see if there are any issues on their end.

I hope these steps help you resolve the issue and successfully add your Gmail account to Mac Mail!