


How to Fix \'SSL3_GET_SERVER_CERTIFICATE: certificate verify failed\' Errors in PHPMailer?
Troubleshoot SSL Certificate Verification Failures in PHPMailer
PHPMailer users may encounter "SSL3_GET_SERVER_CERTIFICATE: certificate verify failed" errors when sending emails from servers with self-signed certificates. This issue arises due to SSL certificate verification introduced in PHP 5.6.
Root Cause:
By default, PHPMailer verifies SSL certificates to ensure their authenticity. When a self-signed certificate is encountered, the verification fails due to the absence of an appropriate CA (Certificate Authority).
Solution:
To resolve this issue, you have two options:
1. Fix SSL Configuration:
If possible, obtain a valid SSL certificate that is signed by a trusted CA and install it correctly on your mail server. This will ensure successful certificate verification.
2. Disable SSL Certificate Verification (Not Recommended):
Warning: Disabling certificate verification has serious security implications. It exposes you to the risk of man-in-the-middle attacks.
To disable certificate verification, set the following PHPMailer options:
<code class="php">$mail->SMTPOptions = array( 'ssl' => array( 'verify_peer' => false, 'verify_peer_name' => false, 'allow_self_signed' => true ) );</code>
Editing the PHPMailer library to disable verification is highly discouraged as it will break upon upgrades.
Security Considerations:
Disabling SSL certificate verification should only be considered as a temporary workaround, not a long-term solution. It is crucial to secure your SSL configuration to prevent potential security breaches.
The above is the detailed content of How to Fix \'SSL3_GET_SERVER_CERTIFICATE: certificate verify failed\' Errors in PHPMailer?. For more information, please follow other related articles on the PHP Chinese website!

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