Ragazzi, ho risolto.
Posto l'intero codice magari possa servire a qualcuno.
Codice PHP:
$elenco = array();
$array=explode("\r\n",$_POST['textarea']);
$count=0;
foreach($array as $row['campo'] ) {
$campo=$row['campo'];
$query= mysql_query("SELECT email FROM email WHERE email='$campo' ");
$email=mysql_fetch_array($query);
//echo $email[0]."+++++++++++++
";
if($email[0]!=""){
} else {
echo $row['campo']."; ";
$a=mysql_query("INSERT INTO email (email) VALUES(\"$campo\")") or die (mysql_error());
$count=$count+1;
}
unset($campo);
unset($query);
unset($email);
}