What are potential reasons for SSL certificate verification failures when using PHPMailer?

SSL certificate verification failures when using PHPMailer can occur due to outdated or missing CA certificates on the server, incorrect server configurations, or network issues. To solve this issue, you can disable SSL certificate verification in PHPMailer by setting the `SMTPOptions` property to not verify the SSL certificate. 

$mail = new PHPMailer(true);
$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);

Keywords

SSL certificate verification PHPMailer failures reasons

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