1. Tick the check box of the Alternate Name List to enable the gateway to send ETRN requests that specify its alternate name list to all the remote SMTP hosts.
2. Tick the check box of the Send ETRN to enable the gateway to send an ETRN request to a specific host to which there might not be any outbound mail. This ensures that even though there is no outbound mail to that host where SMTPC runs, the host still receives ETRN requests.
An option to add or delete hostnames is also available. To add a hostname, enter the hostname and click the Add button. To remove a particular hostname from the list, select an entry from the list and click the Delete button.
3. Tick the check box Send keep alive packets for TCP to establish a dial-up connection (typically PPP or some ISDN connections). Some TCP/IP stacks can be configured to time out and automatically disconnect after a pre-determined period of zero network activity. Under this condition, it is necessary for the gateway to keep the stack active if you want the SMTPD to continuously receive incoming mail. This option enables SMTPD to keep sending alive packets to maintain the dial-up connection.
4. Tick the check box of the Run a program when connection is established to allow the administrator to define the path of the program to be run after the connection is made.
5. To immediately implement the settings, click the Apply button. To discard the changes, click the Reset button.
NOTE: Clicking the Disable ETRN Support button will display another screen where you can disable ETRN support.