Procedure

1. Go to Administration → IMSVA Configuration → SMTP Routing.
2. Click the Connections tab.
   The Connections screen appears.
3. Specify the SMTP Interface settings.
   • 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”.

      Note The "permit list" or "deny list" configured here overrides the Approved List or Block List configured for SMTP Traffic Throttling.

   2. Configure the list.
      • Single computer: Specify an IP address and then click >> to add it to the list.
      • Group of computers:
        1. Select the IP version.
           • For IPv4 addresses, specify a subnet address and mask.
           • For IPv6 addresses, specify a subnet address.
        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
        2001:db8:10ff::ae:44f2
        2001:db8::/32
5. Click Save.