Installation instructions

16  Installing GFI MailSecurity GFI MailSecurity for Exchange/SMTP
 Single computer: Select this option to specify one particular host
that will relay email via this server. If you want to look up the IP
address of a specific host, click DNS Lookup.
 Group of computers: Select this option to specify the base IP
address for the computers that you want to relay.
 Domain: Select this option to include all the computers of a
specified domain. This means that the domain controller will
openly relay emails via this server. Please note that this option
adds processing overhead, and may reduce SMTP service
performance because it includes reverse DNS Lookups to verify
the domain name of all IP addresses that try to relay.
Step 5: Configure your mail server to relay email via the
Gateway server
After you have configured the IIS SMTP service to send and receive
email, you must configure your mail server to relay all email to the mail
relay server:
If you have Microsoft Exchange Server 4/5/5.5:
1. Start the Microsoft Exchange Administrator and double-click on
Internet Mail Service to open the properties configuration dialog box.
Screenshot 7 - The Microsoft Internet mail connector
2. Click the Connections tab and in the Message Delivery area click
Forward all messages to host. Type the computer name or IP of the
machine running GFI MailSecurity.