I'm not sure i can help, but i use e-smith 4.1.2 and entourage on the mac. however, i don't use e-smith as a mail server (just as a router & file server). so, i simply configure entourage to use my isp's smtp server. and obviously, i set the mac's tcp/ip to DHCP (or at least point at e-smith ip as the router address, if setting manually). no problems - i use it all day, every day.