Unable to Send Emails via Gmail: Troubleshooting \'535 Username and Password Not Accepted\' Error?

Unexpected SMTP Response Code: Troubleshooting "535 Username and Password Not Accepted" Error

When attempting to send emails via Gmail using SwiftMail, an error may occur indicating "Expected response code 250 but got code '535', with message '535-5.7.8 Username and Password not accepted.'" This issue can arise due to perceived spam behavior.

To resolve this problem, consider the following steps:

• Disable Less Secure App Access: Enable "Allow less secure apps" in your Gmail settings to permit SwiftMail to bypass security restrictions.
• Remove Captcha Verification: Disable Google's captcha verification to streamline the login process.
• Enable Two-Step Verification: Enable two-step verification to enhance account security.

However, if these measures fail, implement the following solution:

1. Enable Two-Step Verification: Visit Google's "Two-Step Verification" page and activate the feature.
2. Create App Password: Generate an app password specifically for your email system.
3. Update Environment File: Replace the Gmail password in your environment file (.env) with the app password generated in step 2.
4. Restart Server: Restart your web server to apply the changes.

By completing these steps, you should be able to successfully send emails via Gmail using SwiftMail.

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