How to Fix PHPMailer SSL Certificate Verification Failure with Self-Signed Certificates?

Fixing PHPMailer SSL Certificate Verification Failure

When attempting to send emails using PHPMailer and a mail server with a self-signed certificate, users may encounter the error "SSL3_GET_SERVER_CERTIFICATE:certificate verify failed." This issue arises due to SSL certificate verification introduced in PHP 5.6.

To resolve the problem, one should consider the following approaches:

Restore Old Behavior:

Adjust the SMTPOptions property to disable certificate verification:

<code class="php">$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);</code>

Security Implications:

Disabling SSL verification weakens security as it allows attackers to impersonate legitimate entities. Therefore, it's crucial to assess the risks and ensure that appropriate measures are taken to protect your communication.

Alternative Solutions:

If disabling certificate verification is not an option, consider the following:

• Install a valid SSL certificate on the mail server.
• Use a different mail library or consult documentation on advanced certificate handling in PHPMailer.

Remember that editing the PHPMailer library is not recommended, as it may break upon updates.

The above is the detailed content of How to Fix PHPMailer SSL Certificate Verification Failure with Self-Signed Certificates?. For more information, please follow other related articles on the PHP Chinese website!