More mail send at a time using mail function in php

   $to = "contactus@innoppl.com";
   $too = "contactus@innomobileapps.com";
   $to2 = "ponpandian.paulswamy@innoppl.com";
   $to3 = "nash@innoppl.com";
   $to4 = "sathishkumar.m@innoppl.com";

mail("$to,$too,$to2,$to3,$to4", $subject , $messages , $headers)