How to Resolve \'Expected Response Code 250 but Got Code 535\' SMTP Authentication Error?

Expected Response Code 250 but Received Code 535: Resolving SMTP Authentication Error

Upon attempting to send an email via SMTP through Gmail using SwiftMail, an error occurred indicating "Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted." This error stems from an authentication issue with the provided credentials.

To address this, enabling "access for lesser apps" and unlocking the Gmail captcha did not provide a resolution. However, implementing 2-step verification and creating an app password proved successful.

Solution:

1. Enable 2-step verification for your Google account.
2. Generate an app password. Select "Others (custom name)" and click "Generate."
3. Update your .env file. Replace the previous Gmail password with the generated app password (in the MAIL_PASSWORD environment variable).
4. Restart your Apache server to refresh the configuration changes.

After these steps, the email sending functionality should be restored. This solution eliminates the authentication error by utilizing a dedicated app password that grants access to your Gmail account.

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