Here are a few question-based article titles that fit the content you provided: * PHPMailer Error: SSL3_GET_SERVER_CERTIFICATE: certificate verify failed - How to Troubleshoot? * Self-Signed Certific

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.

The above is the detailed content of Here are a few question-based article titles that fit the content you provided: * PHPMailer Error: SSL3_GET_SERVER_CERTIFICATE: certificate verify failed - How to Troubleshoot? * Self-Signed Certific. For more information, please follow other related articles on the PHP Chinese website!