le agregue lo siguiente
Código PHP:
if( !empty($_POST['email'])) {
$aLista=$_POST['email'];
foreach ($_POST['email'] as $v)
{
mysql_select_db($database_connection, $connection);
$query_sql="select * from informesp WHERE Folio IN (".implode(',',$aLista).")";
$res = mysql_query($query_sql, $connection) or die(mysql_error());
$query_sql = mysql_fetch_assoc($res);
echo $query_sql['Folio'];
y me arrojo lo siguiente You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '
[email protected],
[email protected])'