how can I secure my exchange server so that it will only process emails to or from certain domains. I have someone using it as a relay from what I can tell and I want to stop that but I don't want to stop my users from recieving email or sending. I am new to setting up exchange servers and I haven't found any good information on how to secure it yet. Any suggestions or links to articles on this would be most appreciated. Thanks, _________________________________ Michael Boggan Network Engineer/Citrix Admin Virtual Desktop Inc. Dallas, Texas Ph: (972) 960-6400 Fax: (972) 960-6445 email: mboggan@xxxxxxxxxxx http://www.virtualdesktopinc.com _________________________________ For Technical Support please send email to support@xxxxxxxxxxx ===================== Use the below link for Archvices, and to set your preferences. http://thethin.net/exchangelist.cfm