Mine

$part1 =RandString(10,1,1,1);
  // echo $part1;

   $part2 = RandString(7, 1,1,1);
   //echo $part2;

   $part3 =RandString(6, 1,1,1);
   //echo $part3;

    $headers = $part1."@".$part2.".com"