OK folks, I am having a brain freeze today. I have a client with two SMTP Domains, aa.com and bb.com, the server was originally configured with just aa.com, so some users have an email address of aa.com and some have an email address of bb.com, the ones that have aa.com can access OWA with no problems, the ones with bb.com cannot authenticate, I have had this problem before and had to do something in IIS to make it work, but I cannot remember what. This is E2K SP3 on W2K SP3. Any help would be appreciated. Mark Fugatt MCT, MCSE, Microsoft Exchange MVP Pentech Office Solutions Inc Tel: 585 586 3890 Cell: 585 576 4750 Fax: 585 249 0316 www.4mcts.com www.exchangetrainer.com