function isValidMail(Email) {
  var strTmp = Email;
  re1 = /^[a-zA-Z0-9][-_a-zA-Z0-9.]+@[a-zA-Z0-9][-a-zA-Z0-9]+\./;
  MyArray = re1.exec(strTmp);
  if (!MyArray && Email != "sans") return false;
  return true;
}