The installer will now prompt you for which IP address you wish SLmail to bind for port 25 (SMTP receive). In the drop down list box you will have the options for All and then a list of IP addresses available on this machine.
SLmail Installation Bind to IP dialog box
If you choose All, SLmail will bind port 25 on all available IP addresses.
If you choose to select a specific IP address, SLmail will only bind port 25 to that specific IP address and will not respond to port 25 calls on any other IP addresses.
Select the IP addresses that you want to be bound to port 25 and then click Next .