How to Configure a Stand-Alone IIS SMTP Server to Relay to a Remote Domain

How to Configure a Stand-Alone IIS SMTP Server to Relay to a Remote Domain
  • Start Internet Information Services Manager or open the Internet Information Services (IIS) snap-in.
  • Expand Server_name, where Server_name is the name of the server, and then expand Default SMTP Virtual Server.
  • Right-click Domains, point to New, and then click Domain.
  • Click Remote, and then click Next.
  • Type the name of the new remote domain in the Namebox.You can specify a single domain, or you can use an asterisk (*) as a wildcard character (the asterisk must be at the beginning of the name and be separated from the rest of the name by a period) to specify more than one domain. For example, if you want the remote domain to accept mail for and all its subdomains, use the name *
  • Click Finish.
  • In the right pane, right-click the new remote domain that you just created, and then click Properties.
  • Click the General tab.
  • Under Select the appropriate settings for your remote domain, click to select the Allow incoming mail to be relayed to this domain check box to allow the SMTP server to act as a mail relay.
  • Under Route domain, click Forward all mail to smart host, and then type the IP address or the fully qualified domain name (FQDN) of the internal network’s corporate mail server. If you use an IP address, make sure that you use brackets “[]” to enclose the IP address. For example, [nnn.nnn.nnn.nnn].
  • Click OK.

Stop and start the SMTP virtual server. To do so, right-click Default SMTP Virtual Server, and then click Stop. After the virtual server stops, right-click Default SMTP Virtual Server again, and then click Start.

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