In this chapter we focused on the Edge Transport server role included in the Exchange Server 2007 product. We went over the requirements of the server role as well as step-by-step instructions on how you deploy one or more edge transport server(s) in your perimeter network (DMZ or screened subnet). We then had a look at the available antispam filtering agents as well as how they are configured. Then we discussed how you properly secure an Edge Transport server using the Security Configuration Wizard (SCW). Lastly, we had a look at the transport rules agent and as well as the address rewriting feature, and we briefly discussed how you can and why you should monitor an edge transport server using a monitoring solution such as Microsoft Operations Manager (MOM) 2005.