Warning: Header may not contain more than a single header, new line detected. in

[surferbloggy]

questo codice mi da l'errore

    if (!validEmail($Email))
  {
  
   header("Location:[url]http://www.miosito.it/contacts.php?msg=the[/url] email is incorrect&name=".$_REQUEST['Name']."&company=".$_REQUEST['Company']."&email=".$_REQUEST['Email']."&phone=".$_REQUEST['Phone']."&country=".$_REQUEST['Country']."&notes=".$_POST['Notes']);
   
   }else{
   
   header("Location:[url]http://www.miosito.it/contacts.php?msg=Please[/url] fill the mandatory fields, thank you&name=".$_REQUEST['Name']."&company=".$_REQUEST['Company']."&email=".$_REQUEST['Email']."&phone=".$_REQUEST['Phone']."&country=".$_REQUEST['Country']."&notes=".$_POST['Notes']);
} 

ma non funzione nemmeno con trim e con urlencode

così

  $what3 = "Location:[url]http://www.miosito.it/contacts.php?msg=Please[/url] fill the mandatory fields, thank you&name=".$_REQUEST['Name']."&company=".$_REQUEST['Company']."&email=".$_REQUEST['Email']."&phone=".$_REQUEST['Phone']."&country=".$_REQUEST['Country']."&notes=".$_POST['Notes'];

$what3 = trim($what3);
$what3 = rawurlencode($what3);
  
  header("Location: [url]http://www.miosito.it/contacts.php[/url]".$what3); 

come si risolve questo problema in php??

grazie dell'aiuto