We had a user leave the company. Her account was deleted in active directory. But anytime anybody sends to any of the mailing groups she was in I get a copy of the undeliverable. (The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.) We are on Exchange 2003. I've looked EVERYWHERE in AD and can't find that account. I've also unchecked "use cached Exchange mode" on various people's machines and there is no change.