Help !!! I have been unable to accomplish this so far. I have added the second domain, setup the ISP ok and added the 2nd address for the users. However due to the restrictions placed by Relaying on 5.5 I have been unable to get the second domain up and running - always getting 550 Relaying denied. I can find nothing specific on Google. I think I have to do someting with the address space * but don't know what to do ! Can some one assist me in getting setting my second domain up on 5.5 ? Thanks in advance. Simon