Question : Connect Server Antispam

Hello.

I´m trying to test a software antispam and for that i installed a network lab which consist in a server antispam, echange 2010 and a pc client with outlook 2010.
To really probe the antispam software and to receive mails from outside the network i have an MX register with my ISP.
Which do you think will be the best way to connect the antispam server to receive the outside mail and redirect those mails to the exchange server?.
Actually i have two NIC´s in my antispam server, one for the internet and one for the intranet.

Answer : Connect Server Antispam

your exchange server must have a private ip, and you must configure your antispam server to fordward all incomming emails (from the external IP) to the private exchange IP