3 Ways to Fix Gmail Login Failed in the Mail App on Mac

If Gmail suddenly stops signing in inside the Mail app on your Mac, the problem is usually tied to an account authentication issue, a Google security setting, or a Mail app sync problem. The good news is that you can often fix it without deleting your email account permanently.

This guide walks through three effective fixes for Gmail login failed errors in Apple Mail, starting with the simplest checks and moving to more targeted account and app troubleshooting.

1. Sign Out of the Gmail Account and Add It Again

When Mail can no longer verify your Gmail credentials, removing and re-adding the account is often the fastest fix. This forces macOS to create a fresh authentication session and clear out stale sign-in data.

1. Open Mail on your Mac.
2. Go to Mail > Settings and select the Accounts tab.
3. Choose the Gmail account that is failing to log in.
4. Remove the account from Mail if the option is available, or remove it from System Settings > Internet Accounts.
5. Add the account again using the Google sign-in window and complete the verification process.

2. Check Google Security and IMAP Settings

If the account is correct but Mail still cannot log in, Google may be blocking the connection or IMAP may not be enabled. Apple Mail relies on IMAP to sync Gmail messages properly.

1. Sign in to your Gmail account in a web browser.
2. Open Gmail settings and make sure IMAP is enabled.
3. Check your Google Account security page for any alerts, blocked sign-in attempts, or requests to verify your identity.
4. If you recently changed your Google password, update the password in Mail by reauthenticating the account.
5. If you use two-factor authentication, make sure the Mac is completing the Google sign-in flow instead of trying to use the old password directly.

3. Reset the Mail App Connection and Test for Corrupt Account Data

If re-adding the account and checking Google settings do not help, the Mail app itself may have cached bad account data. In that case, resetting the local Mail connection can help force a clean sync.

1. Quit Mail completely.
2. Open System Settings and go to Internet Accounts.
3. Select the Gmail account and turn Mail off, then back on if available.
4. If the problem continues, remove the account and add it again after restarting Mail.
5. Open Mail and test whether new messages sync and whether the sign-in prompt completes normally.

When the Problem Still Happens

If none of the three fixes work, the issue may be tied to a macOS update problem, a temporary Google outage, or a deeper account sync conflict on the Mac. At that point, it helps to check whether other email accounts work in Mail, try the Gmail account on another device, and confirm that your Mac has a stable internet connection.