How to resolve SwiftMail Authentication Error in Laravel due to insufficient user credentials?

SwiftMail Authentication Error: Insufficient User Credentials

When attempting to send emails through Gmail using SwiftMail, you may encounter the error "Expected response code 250 but got code "535", with message "535-5.7.8 Username and Password not accepted." This indicates that the email delivery service has rejected your authentication credentials.

Possible Causes:

• Spam Filtering: Gmail's anti-spam measures can temporarily block accounts it suspects of sending spam.
• Incorrect Credentials: Ensure you have entered the correct username and password in your email configuration settings.
• Two-Step Verification (2FA) Enabled: If 2FA is enabled for your Gmail account, you will need to use an app-specific password instead of your regular password.

Solution:

To resolve this issue, follow these steps:

1. Disable 2FA if necessary: If 2FA is enabled, you can temporarily disable it while sending emails. Note that this will weaken your account's security.
2. Create an App Password: Generate an app password specifically for the email sending application. It will be used in place of your regular password.
3. Edit Environment File: In your Laravel environment file, update the MAIL_PASSWORD variable with the generated app password.
4. Restart Apache Server: Restart your Apache server to apply the changes.

After completing these steps, your email sending should function correctly. If the issue persists, consult the documentation for SwiftMail or seek assistance from Gmail support for further troubleshooting.

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