dovrebbe funzionare... provalo

Codice PHP:
$headers = "From: $NOMEMAILINGLIST\nReply-To: $TUAMAIL\nContent-Type: text/html\n";
$addresses = @file("TUOFILETESTO") or die("FILE MANCANTE");
foreach ($addresses as $email){
$email = trim($email);
if(mail($email,$HTTP_POST_VARS[subject],stripslashes($HTTP_POST_VARS[message]),$headers));
}