3. Click Only the list below, click Add, and then add the IP of your
mail server that will be forwarding the mail to this server. You can
specify a single computer, group of computers or a domain:
a) Single computer: Specify one particular host that you want to
relay off of this server. If you click the DNS Lookup button,
you can lookup an IP address of a specific host.
b) Group of computers: Specify a base IP address for the
computers that you want to relay.
c) Domain: Select all of the computers in a domain by domain
name that will openly relay. This option adds processing
overhead, and might reduce the SMTP service performance
because it includes reverse DNS lookups on all IP addresses
that try to relay to verify their domain name.
Step 5: Configure your mail server to relay mail via the mail
After you have configured the IIS SMTP service to send and receive
mail, you must configure your mail server to relay all mail to the mail
relay server. To do this;
If you have Microsoft Exchange Server 4/5/5.5:
1. Start up
Microsoft Exchange Administrator
2. Go to the
Internet Mail Service
and double click on it to configure
The Microsoft Internet mail connector
3. Go to the
4. Message Delivery section, select Forward all messages to host .
Enter the computer name or IP of the machine running GFI
5. Click OK and restart Exchange server. This can be done from the