Denermisiniz :

ob_start();
header("Content-type:text/html;charset:utf8");
function gonder($gonder_isim,$gonder_mail,$alan_mail,$baslik,$mesaj){ 
$mailtanim = "MIME-Version: 1.0\r\n"; 
$mailtanim .= "Content-type: text/html; charset=UTF-8\r\n"; 
$mailtanim .= "From: $gonder_isim <$gonder_mail>\r\n"; 
$mailtanim .= "Reply-To: $gonder_isim <$gonder_mail>\r\n"; 
return @mail($alan_mail,$baslik,stripslashes($mesaj),$mailtanim); 
}
    $to = "mail@mail.com"; 
    $subject = "Siteden Mesaj Var";  
    $date = date ("l, F jS, Y");  
    $time = date ("h:i A");      
    $msg=" 
    Ad Soyad: $_REQUEST[name] 
    Mail Adresi: $_REQUEST[email] 
    Web Sitesi: $_REQUEST[web] 
     
    Mesaj gönderilme zamanı  $date, hour: $time.\n 

    Mesaj: 
    $_REQUEST[message]"; 
	gonder($_REQUEST["name"],$_REQUEST["email"],$to,$subject,$msg);
    echo "Mesajınız Elimize Ulaştı Teşekkürler ...";