Send Mail Fals ?

$to = " ";
$subject = "mere";
$body = "fncmgmdfgmfmgf";
$headers = "From:  n";
mail($to,$subject,$body,$headers);
echo "Mail sent to $to";
if(mail($to,$subject,$body,$headers)) {
echo "Am Trimis un email la $to cu subiectu $subject";
} else {
echo "email`u nu a fost trimis ! verifica daca $to chiar exista ";
}