Troubleshoot and resolve Call to undefined method getRawHeader() errors. Troubleshoot and resolve Call to undefined function PHPMailer
HPMailerscapeshellarg() errors. Troubleshoot and resolve issues with broken domain renewal links in emails. Troubleshoot and resolve unexpected client details on an invoice. Troubleshoot and resolve unexpected changes to a service's Next Due Date value. The system is unexpectedly suspending services (for example, hosting accounts). The system is unexpectedly terminating services (for example, hosting accounts). Troubleshoot and resolve unexplained declined cards and failures. Troubleshoot and resolve transactions that the system isn't recording. Troubleshoot and resolve The sender's email address is not registered. (WHMCS 8.4 and later) or Unregistered Email Address (WHMCS 8.3 and earlier) errors. Troubleshoot and resolve issues with sending general emails to clients. Troubleshoot and resolve issues with ticket notification emails. Troubleshoot and resolve issues with welcome emails not sending. Troubleshoot and resolve Unsupported Protocol errors. Troubleshoot and resolve Make certain that you have selected a valid Update Channel and then try again errors. Troubleshoot and resolve Apply update dry-run detected permission issues errors. Troubleshoot and resolve Update Failed errors. Troubleshoot and resolve Update Message Validation Issue errors. Troubleshoot and resolve issues that redirect users to an incorrect page. Troubleshoot and resolve Unable to create account in Panel. The field 'username' is required. errors.