$email = 'xyz@email.com,abc@email.Com,and others@email.com';
AND
  $msg = 'SEND these to each email above thanks';

$to = 'xyz@email.com';
  $msg = 'SEND these to each email above thanks';
  $to = 'abc@email.com';
  $msg = 'SEND these to each email above thanks';
   $to = 'others@email.com';
  $msg = 'SEND these to each email above thanks';



  foreach($email as $email)
  {
  $to = $email["to"];


   $subject = 'the subject';
   $message = '$msg';
   $headers = 'is this really? ';
   mail($to, $subject, $message, $headers);

   }