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:
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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