Step 4: Secure your mail relay server.

In this step you will specify your mail server name, and any other mail servers that will send mail via this mail relay server. Effectively you will limit the servers that can send mail through this server. If you don't create restrictions anyone can use your mail relay server as an open relay (i.e. Spamming). To prevent this:

  1. Open the properties of the Default SMTP Virtual Server.
  2. On the Access tab, click Relay.
  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 computer or a domain:
  4. 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.
  5. Group of computers: Specify a base IP address for the computers that you want to relay.
  6. 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.

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