I read several posts, and have tried each differnt solution in turn. Here's my delima, When I change the settings on the routing tab, then "routing restrictions", and check the box "Hosts and clients with these IP address" and do not define any IP address, after restarting, it stops relaying, but if I send an email outside of the users on the exchange server I get "550 Relay not allowed" (or similar). I'm trying to prevent someone using the server for spam, but not limit the users on the server from sending emails outside of the domain.(I host many sites and offer email hosting for those sites through this server). In a nut shell, I want everyone on the server to be able to send there emails and recieve their emails, but I don't want someone being able to send spam through the unprotected server.<br>Thanks ahead of time, Dale