How to Deal with \"SSL3_GET_SERVER_CERTIFICATE:certificate verify failed\" Error in PHPMailer?

How to Handle SSL Certificate Verification Failure with PHPMailer

When sending emails from a server with a self-signed certificate, it's common to encounter the error "SSL3_GET_SERVER_CERTIFICATE:certificate verify failed." This issue arises due to SSL certificate verification introduced in PHP 5.6.

To address this problem, you have two options:

1. Fix SSL Certificate: The preferred approach is to fix your SSL certificate to ensure its validity, such as obtaining a certificate from a trusted authority.
2. Disable Certificate Verification: If you don't want to fix your SSL certificate, you can disable certificate verification by setting the SMTPOptions property:

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

However, it's crucial to note that disabling certificate verification can have security implications. Without proper authentication of SSL connections, attackers can impersonate trusted endpoints and perform man-in-the-middle attacks. Therefore, it's strongly recommended to secure your SSL certificate before implementing this workaround.

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