When using PHPMailer to send emails through Gmail, it's common to encounter the frustrating "SMTP Error: Could not authenticate" message. This error can arise due to multiple factors, and its resolution requires careful investigation.
One potential solution to this issue lies in enabling "Allow less secure apps" within your Gmail account settings. Navigate to the "My Account" section of your Gmail account, select "Sign-in & Security," and scroll down to the "Apps with account access" section. Turn the "Allow less secure apps" option to "ON" and attempt to send the email again.
In the provided PHP script, it's essential to ensure that the provided credentials are correct and that the server settings are configured as follows:
If the issue persists after enabling less secure apps, consider verifying that your PHP environment has the OpenSSL extension enabled and that Apache 2.2.16 is running with mod_ssl. Configuring OpenSSL for SSL/TLS connections is crucial to establish a secure connection with Gmail's SMTP server.
Alternatively, you can use Port 465 with SSL authentication. Set SMTPSecure to "ssl" and Port to 465 in your PHP script. This may require additional adjustments within your hosting provider's settings to allow SSL connections on this port.
Remember, these solutions depend on the specific configuration of your email provider and hosting environment. If none of the mentioned solutions resolve the issue, it's recommended to contact your hosting provider or email provider for further assistance in troubleshooting the authentication problem.
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