Installing Mail essentials on a separate machine System requirements Installing & configuring IIS 5 SMTP service Step 1: Verify the Installation of the SMTP Service Step 2: Specify mail relay server name and assign an IP Step 3: Configure the SMTP Service to relay mail to your mail server Step 4: Secure your mail relay server. Step 5: Configure your mail server to relay mail via the mail relay server Step 6: Point the MX record of your domain to the mail relay server. Step 7: Test your new mail relay server! Step 8: Running Mail essentials set-up