add these local domains in the MailSecurity configuration. For more
information see `Adding additional local domains' in the Advanced
If you add additional local domains in IIS SMTP service, they will not
be automatically recognized until you enter them in the MailSecurity
configuration. This allows you to setup remote smart hosts for
particular domains that are not local.
Configure the domain to relay mail to your mail server:
1. In the properties for the domain that you just created, click to
select the Allow the Incoming Mail to be Relayed to this Domain
2. If this is being set up for an internal domain, you should specify the
server that receives email for the domain name by the IP address
in the Route domain dialog box.
3. Click the forward all email to smart host option, and then type the
IP address of the server that is responsible for email for that
domain in square brackets. For example:
Typing the IP address of the server in square brackets is
necessary so that the server recognizes this is an IP address and
not a host name.
4. Click OK.
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:
1. Open the properties of the Default SMTP Virtual Server.
2. On the Access tab, click Relay.