Procedure

1. Go to Administration → IMSS Configuration → SMTP Routing.
2. Click the Connections tab.
   The Connections screen appears.
3. Specify the SMTP Interface settings.
   • IP address: Select the interface that will connect with your SMTP server.

     Loopback address

     The SMTP server will only listen to the IP address on the local computer.

     All interfaces

     If there are multiple IP addresses on the computer, the SMTP server will listen to any of the IP addresses available.

   • Port: Specify the listening port of the SMTP server.
   • Disconnect after { } minutes of inactivity: Specify a time-out value.
   • Simultaneous connections: Click No limit or Allow up to { } connections and specify the maximum number of connections.
4. Specify the Connection Control settings.
   1. Select Accept all, except the following list to configure the "deny list" or Deny all, except the following list to configure the "permit list”.
   2. Configure the list using any of the following options.
      • Single computer: Specify an IP address, and then click >> to add it to the list.
      • Group of computers:
        1. Specify a subnet address and mask for an IP address group.
        2. Click >> to add the group to the list.
      • Import from file: Click to import an IP list from a file. The following shows sample content of an IP list text file:
        192.168.1.1
        192.168.2.0:255.255.255.0
        192.168.3.1:255.255.255.128
        192.168.4.100
        192.168.5.32:255.255.255.192
5. Click Save.