How to Fix \"Certificate Verify Failed\" Error When Using PHPMailer with a Self-Signed Certificate?

PHPMailer SSL Verification Issue: Certificate Verify Failed

Problem:

When trying to send emails from a mail server with a self-signed certificate, PHPMailer throws the following error:

PHP Warning: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed in class.smtp.php on line 327.

Solution:

Starting with PHP 5.6, SSL certificate verification has been introduced. To revert to the old behavior without verification, set the SMTPOptions property in PHPMailer:

<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. Without verification, malicious actors can impersonate trusted endpoints and perform Man-in-the-Middle Attacks. Consider these risks before using this solution.

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