PHPMailer - Troubleshooting SSL3_GET_SERVER_CERTIFICATE: Certificate Verify Failed
PHP 5.6 introduced SSL certificate verification, enhancing security but potentially causing issues if the SSL configuration is incorrect. Encountering the error "SSL3_GET_SERVER_CERTIFICATE: certificate verify failed" indicates a problem with certificate verification.
One possible cause is a self-signed certificate on the email server. To resolve this issue, you can set the stream context params to ignore certificate verification:
<code class="php">$options['ssl']['verify_peer'] = false; $options['ssl']['verify_peer_name'] = false; $options['ssl']['allow_self_signed'] = true;</code>
Alternatively, you can revert to the previous behavior by setting the SMTPOptions property to skip certificate verification:
<code class="php">$mail->SMTPOptions = array( 'ssl' => array( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true ) );</code>
Note: Disabling SSL verification has security implications. It allows attackers to impersonate trusted endpoints and launch Man-in-the-Middle Attacks. Use this solution with caution and understand the potential risks.
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