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The solution to repairing a certificate issue with PHP mailer is to update the certificate file used by the script to authenticate the SMTP server. This can be done by downloading and installing the latest version of the certificate file from the certificate authority's website, or by using a trusted third-party certificate bundle. Once the new certificate file is installed, the script should be updated to reference the new path and file name for the certificate. Alternatively, you can disable verification of the certificate, but this is not recommended as it makes the connection less secure.