The first thing you have to do is install the SMTP service on the machine that will act as the ISA Server. Make sure that the server you are using has two network interface cards (NICs) installed. One NIC will connect the server to the internal network; the other one will be exposed to the outside world.
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- Open the Control Panel and select the Add/Remove Programs option.
- When the Add/Remove Programs applet opens, click the Add/Remove Windows Components button to launch the Windows Components Wizard.
- Select the Application Server option and click Details.
- Pick the Internet Information Server (IIS) option and click Details again.
- Mark off the checkbox next to the SMTP Service and click OK twice, followed by Next.
Windows will now install the SMTP Service. You may be prompted for your Windows installation CD during this process.
How to use an ISA Server as an SMTP filter
Install the SMTP service
Configure the Internet Information Server
Install ISA Server 2004
Create an SMTP publishing rule
Create a DNS publishing rule
Configure the message screener
Change your DNS server's MX record
About the author
Brien M. Posey, MCSE, is a Microsoft Most Valuable Professional for his work with Windows 2000 Server and IIS. Brien has served as the CIO for a nationwide chain of hospitals and was once in charge of IT security for Fort Knox. As a freelance technical writer he has written for Microsoft, TechTarget, CNET, ZDNet, MSD2D, Relevant Technologies and other technology companies.
This tip originally appeared on SearchSecurity.com.