Multiple Email Addresses for Form Submission

I have two scenarios for my form that will determine if the submission is successful or failed. Either outcome serves the user with a unique page. I am looking for a way that the successful submissions are emailed to group A email addresses and the failed submissions are sent to Group B email addresses.

Here is my code:

<?php session_start();
if(isset($_POST['Submit'])) {



$from=$_POST['empty'];
$to=$_POST['empty'];
$subject=$_POST['empty'];
$text=$_POST['empty'];
$html=$_POST['empty'];
$file=$_POST['empty'];
$mimetype=$_POST['empty'];
$host=$_POST['empty'];
$username=$_POST['empty'];
$password=$_POST['empty'];

$Q1=$_POST['Q1'];
$Q2=$_POST['Q2'];
$Q3=$_POST['Q3'];
$Q4=$_POST['Q4'];

$fromsubject = 'sample-subject';
$firstname = $_POST['firstname'];
$mail = $_POST['mail'];
$phonenumber = $_POST['phonenumber']; 

$to = 'myemail@gmail.com'; 

    $header = "From: <" . $mail . ">\r\n"; //optional headerfields
$mailsubject = 'Message recived from  sample site';
$body = $fromsubject.'

The person that contacted you is  '.$firstname.'
 Phone number: '.$phonenumber.'
 E-mail: '.$mail.'
 Q1: '.$Q1.'
 Q2: '.$Q2.'
 Q3: '.$Q3.'
 Q4: '.$Q4.'



|---------END MESSAGE----------|';

mail($to, $mailsubject, $body, $header);
if ($Q3 == "yes") {
header('Location: http://ift.tt/1FFpOWl');
} else {
header('Location: http://ift.tt/1EbXoUW');
}




?>