Ho un problema: ho inserito in un sito un form per inviare mail alla casella di posta del sito stesso. il problema è che queste mail non arrivano, mentre se imposto come indirizzo del destinatario un mittente diverso queste arrivano.
Codice PHP:
  $query="SELECT * FROM staff WHERE id='$staff'";   
$result mysql_query($query$db); 
$row mysql_fetch_array($result);
 if (
$staff=="") {$target_address "info@dominio.it";}
 else {
$target_address $row[contatto]; 
echo 
"Scrivi a ".$row[nome];}  // CSS classes & styles 
$class_txt "text"
$class_inputbutton "inputButton"
$class_inputline "inputLine"
$class_inputfield "inputField"
$style_inputline "width:355px;"
$style_inputfield "width:355px; ";  
// email 
$email_subject "richiesta informazioni dal sito";  
// error messages 
$err_name =    "Inserisci un nome.";
$err_phone "Inserisci un numero di telefono."
$err_msg "Fai una richiesta."
$err_email "inserisci un indirizzo email valido.";  
// misc text 
$msg_date "Data"
$msg_company "Società";
$msg_name "Nome"
$msg_address "Indirizzo"
$msg_city "CAP/Citta'"
$msg_phone "Tel."
$msg_email "Email"
$msg_answerby "Ricevi la risposta via"
$txt_email "Email"
$txt_phone "Telefono"
$txt_post "Posta"
$txt_send "Invia"
$txt_mandatory "<span class='$class_txt'> i campi con l'asterisco (*) sono obbligatori</span>"
$msg_request "Richiesta"
$msg_indent 11;  
// messages 
$txt_thankyou "<div class='$class_txt'><h2>Grazie per averci contattato!</h2>La tua richiesta è stata inoltrata e sarai contattato al più presto.</div>"
$txt_error "<div style='color: #cc3300' class='$class_txt'><h2>Errore:</h2>{errors}</div>";    
// {errors} is replaced by the errors that occurred   
function spaces($num$fill=" "){     
$foo=""
for (
$i=0$i<$num$i++) 
$foo.=$fill;     
return 
$foo; }  
function 
isValidEmail($addr){     
if(
eregi("^[a-z0-9]+([_.-][a-z0-9]+)*@([a-z0-9]+([.-][a-z0-9]+)*)+\\.[a-z]{2,4}$"$addr))         
return 
true;     
else         
return 
false; }   
// start form evaluation 
$error="foo"
if (
$_REQUEST['do']=="send"){     
$error=false;
if (
$_REQUEST['name']==""$error.="&raquo; $err_name
"
;      
if (
$_REQUEST['fon']==""$error.="&raquo; $err_phone
"
;      
if (
$_REQUEST['message']==""$error.="&raquo; $err_msg
"
;      
if (!
isValidEmail($_REQUEST['email'])) $error.="&raquo; $err_email
"

if (
$error===false){ 
$message="$msg_date:".spaces($msg_indent-strlen($msg_date)).date("d M Y, H:i"time());
if (
$_REQUEST['firma']) 
$message.="\n$msg_company:".spaces($msg_indent-strlen($msg_company)).$_REQUEST['firma'];
if (
$_REQUEST['name']) 
$message.="\n$msg_name:".spaces($msg_indent-strlen($msg_name)).$_REQUEST['name'];         
if (
$_REQUEST['adresse']) 
$message.="\n$msg_address:".spaces($msg_indent-strlen($msg_address)).$_REQUEST['adresse'];
if (
$_REQUEST['ort']) 
$message.="\n$msg_city:".spaces($msg_indent-strlen($msg_city)).$_REQUEST['ort'];         
if (
$_REQUEST['fon']) 
$message.="\n$msg_phone:".spaces($msg_indent-strlen($msg_phone)).$_REQUEST['fon']; 
$message.="\n$msg_email:".spaces($msg_indent-strlen($msg_email))."mailto:".$_REQUEST['email'];
$message.="\n\n".spaces(strlen("$msg_answerby ".$_REQUEST['kontakt'])+1"=");
$message.="\n$msg_answerby ".$_REQUEST['kontakt']."!\n";         
$message.=spaces(strlen("$msg_answerby ".$_REQUEST['kontakt'])+1"=");         
if (
$idannuncio != ""
{
$message .= $_REQUEST['annuncio'];}         
else {         
$message.="\n\n$msg_request:\n\n".$_REQUEST['message'];}  
mail($target_address$email_subject$message"From: ".$_REQUEST['email']);
echo 
$txt_thankyou;              
}else if (
$error!==false$error=str_replace("{errors}"$error$txt_error);  
}  
if (
$error!==false){      
if(
$error!="foo") echo $error;          
// form
echo "<script language='JavaScript' type='text/JavaScript'>\n";     
echo 
"window.onload = function(){ document.form1.firma.focus(); }\n";     
echo 
"</script>\n";     
echo 
"<form name='form1' method='post' action=''>\n";     
echo 
"<table  border='0' cellpadding='1' cellspacing='0' class='txt'>\n";     
echo 
"<tr><td></td>\n";     
echo 
"<td height='19'></td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>$msg_company</td>\n";     
echo 
"<td height='19'><input name='firma' id='firma' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['firma']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>*$msg_name</td>\n";     
echo 
"<td height='19'><input name='name' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['name']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>$msg_address</td>\n";     
echo 
"<td height='19'><input name='adresse' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['adresse']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>$msg_city</td>\n";     
echo 
"<td height='19'><input name='ort' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['ort']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>*$msg_phone</td>\n";     
echo 
"<td height='19'><input name='fon' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['fon']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>*$msg_email</td>\n";     
echo 
"<td height='19'><input name='email' type='text' class='$class_inputline' style='$style_inputline' value='".$_REQUEST['email']."' />\n";     
echo 
"</td></tr>\n";     
echo 
"<tr><td width='75' class='$class_txt'>*$msg_answerby</td>\n"
echo 
"<td height='19' class='$class_txt'><input name='kontakt' type='radio' value='$txt_email' checked=\"checked\" /> $txt_email\n";     
echo 
"<input name='kontakt' type='radio' value='$txt_phone' /> $txt_phone\n";     
echo 
"<input name='kontakt' type='radio' value='$txt_post' /> $txt_post\n";     
echo 
"</td></tr>\n";     
if (
$idannuncio==""){     
echo 
"<tr><td width='75' class='$class_txt'>*$msg_request</td>\n";     
echo 
"<td height='19'><textarea name='message' cols='45' style='$style_inputfield' rows='10' class='$class_inputfield'>".$_REQUEST['message']."</textarea></td></tr>\n"; }          else {         
$db mysql_connect(localhost$username$dbpassword);     
if (
$db == FALSE)     
die (
"Errore nella connessione. Verificare i parametri nel file config.inc.php");
mysql_select_db($database$db)     
or die (
"Errore nella selezione del database. Verificare i parametri nel file config.inc.php");     
$query="SELECT * FROM annunci WHERE id='$id'";     
$result mysql_query($query$db);     
while (
$row mysql_fetch_array($result))     
{
$breve=$row[breve];}           
echo 
"<tr><td width='75' class='$class_txt'> </td>\n";     
echo 
"<td height='19'><textarea readonly='readonly' cols='45' name='message' type='text' id='annuncio' class='$class_inputfield'> Richiedi informazioni per annuncio Rif.".$_REQUEST['idannuncio']." (";         
$query="SELECT * FROM annunci WHERE id='$idannuncio'"
$result mysql_query($query$db);     
while (
$row mysql_fetch_array($result))     
{echo 
$row[breve];     
echo 
") </textarea>\n";}     
echo 
"</td></tr>\n";}     
echo 
"<tr><td width='75' ></td>\n";     
echo 
"<td height='19' align='right'>$txt_mandatory</td></tr>\n";      
echo 
"<tr><td width='75'></td>\n";     
echo 
"<td height='19'><input name='Submit' type='submit' class='$class_inputbutton' value='$txt_send' />\n";     
echo 
"<input name='do' type='hidden' id='do' value='send' /></td>\n";     
echo 
"</tr></table>\n";     
echo 
"</form>\n";  }
 
/* ######################### END Contact Form ########################## 
##################################################################### */   
?>