How to Troubleshoot the \'Stream_Socket_Enable_Crypto\' Warning in PHPMailer?

Troubleshooting PHPMailer's "Stream_Socket_Enable_Crypto" Warning

PHPMailer users may encounter a PHP warning indicating a mismatch between the expected and received certificate while connecting to SMTP hosts. This error is typically triggered when PHP 5.6's enhanced certificate verification mechanism identifies an issue with the remote certificate.

Commonly, the issue arises due to misconfigured or invalid certificates on the remote server. The best solution is to correct the certificate configuration to ensure its validity.

However, if you face situations where it's not feasible to correct the certificates immediately, you can temporarily disable certificate verification in PHPMailer's SMTPOptions setting to allow the message send.

For PHP versions prior to 5.6, the certificate verification error may manifest as an abrupt QUIT command being issued by PHPMailer after attempting a STARTTLS negotiation. In such cases, checking the certificate configuration and adjusting the verification settings may resolve the issue.

It's crucial to note that disabling certificate verification should be a temporary measure until the underlying certificate issues are addressed. Failing to resolve the certificate problems could expose the connection to potential security vulnerabilities.

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