Why Am I Getting 'SMTP Error: Could Not Authenticate' When Sending Emails with PHPMailer?

"SMTP Error: Could not authenticate" in PHPMailer: Resolving SSL/TLS and Authentication Issues

In an attempt to send emails via Gmail using PHPMailer, you may encounter the "SMTP Error: Could not authenticate" message. This error often stems from improper SSL/TLS configuration or incorrect authentication credentials.

SSL/TLS Configuration:

The provided PHP script utilizes "tls" as the secure connection method. Ensure that both Apache and PHP are appropriately configured for SSL/TLS connections. OpenSSL extension should be enabled in PHP and the mod_ssl module should be active in Apache.

Authentication Issues:

Verify the provided username and password. Additionally, for Gmail, consider enabling the "Allow less secure apps" option in your account settings.

Navigate to the following link to access these settings:

https://myaccount.google.com/security

On the left menu, select "Apps with account access" and toggle "Allow less secure apps" to "ON".

Additional Troubleshooting Tips:

• Reconfigure your SMTP server settings in the PHP script to use port 465 with "ssl".
• Check that the firewall is not blocking outgoing SMTP connections on port 587 or 465.
• Consult the PHPMailer documentation for additional troubleshooting steps.

Conclusion:

Resolving the "SMTP Error: Could not authenticate" issue typically involves addressing SSL/TLS configuration and ensuring proper authentication credentials. By implementing the recommendations provided above, you should be able to successfully send emails using PHPMailer through Gmail.

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