<?
include 'include/bd.php';

$comando = "SELECT * FROM news WHERE status = 1 ORDER BY nome";
$exec = mysql_query($comando);
while ($linha = mysql_fetch_assoc($exec)) {	

$string .= $linha[email].";";
}
header('Content-type: text/plain');
header( 'Content-Length: ' . strlen( $string ) ); 
header('Content-Disposition: attachment; filename="save.txt"');

echo $string;
?>