*frowns* Depends on your OS, under windows you pretty much couldn't due to the way binding is performed. Under *nix OSes it's no hassle at all. At 05:43 PM 27/11/2004, you wrote: >Is it possible to limit the SMTP Listener to a single IP address on a multi >homed machine? I would like to free up the SMTP port on my second address >so that I might be able to run an additional mail server on the same >machine. > >Thanks