mail.* from mail left join users as userfrom on
mail_from=userfrom.user_id left join users as userto on mail_to=userto.user_id
where mail_user='$user_id' ";
mail.* from mail left join users as userfrom on
mail_from=userfrom.user_id left join users as userto on mail_to=userto.user_id
where mail_user='$user_id' ";