Unexpected Service SuspensionsThe system is unexpectedly suspending services (for example, hosting accounts).
Unexpected Service TerminationsThe system is unexpectedly terminating services (for example, hosting accounts).
Unregistered Address ErrorsTroubleshoot 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.