//It checks the header column name with the form submitted value and then assigns the corresponding value to the email variable.

var email = "";

for(var i in headers) {
  if (headers[i] == "email") {
     email = e.namedValues[headers[i]].toString();
  }
  message += headers[i] + ' :: '+ e.namedValues[headers[i]].toString() + "\n\n";
}

switch (email)  {
        case "basdf":
            email = "email1@hotmail.com";
            break;
        case "dfdsa":
            email = "email2@hotmail.com";
            break;
        default:
            email = "email3@hotmail.com";
            break;
    }