protected function canSendEmail(\DNDeployment $deployment)
 {
     $deployer = $deployment->Deployer();
     $approver = $deployment->Approver();
     if (!$deployer || !$deployer->exists()) {
         return false;
     }
     if (!$approver || !$approver->exists()) {
         return false;
     }
     return true;
 }