Problémy s odesláním e-mailu

  <?php
   
    $sid = session_id();
require_once ('mysql_spojit.php');
$dotaz = "SELECT CONCAT(kos_nazev) AS kos_nazev,(kos_mnozstvi) AS kos_mnozstvi,(kos_cena) AS kos_cena  FROM kosik where kos_session_id = '$sid'";  //desc 

$vysledek = @mysql_query ($dotaz);
if ($vysledek) {
    
     while ($radek = mysql_fetch_array($vysledek, MYSQL_NUM)) {
    $cena=$radek[2];
  $celkem+=$cena;
  $platba= $celkem + 120;
  
   $nazev=$radek[0];
   $nazvy=$nazev.",".$radek[0];
 }
 
  
  
    
   
   $email = $_POST['email'];
    $telefon = $_POST['telefon'];
    $firma = $_POST['firma'];
    $jmeno = $_POST['jmeno'];
    $ulice = $_POST['ulice'];
	$mesto = $_POST['mesto'];
	$psc = $_POST['psc'];
	$ic = $_POST['ic'];
	$dic = $_POST['dic'];
	$prijmeni = $_POST['prijmeni'];

	
	
    
    $mujmail = "info@jihoceskareklama.cz";
    $predmet = "$jmeno $prijmeni - Objednávka";
    $hlavicka = "From:$email";
  
    
    $zprava="email: $email\n telefon: $telefon\n firma: $firma\n jmeno: $jmeno\n Příjmení: $prijmeni\n ulice: $ulice\n mesto: $mesto\n psc: $psc\n ico: $ic\n dic: $dic\n obrazy k prodeji: $nazvy\n cena celkem: $platba Kč ";
    if (trim($email)!="" && trim($jmeno)!="" && trim($ulice)!="") {
        $vysledeks = mail($mujmail, $predmet, $zprava, $hlavicka);
        ..................................
        ................................
        ...............................

  $nazev=$radek[0];
   $nazvy=$nazev.",".$radek[0];