i am trying to setup an email server on a client / server model. i have one PC with win server 2003 and other with XP. they both talk to each other using a cross over network. i have setup dns on server and made sure client & server both have the same domain name. i have also made a user in Active directory so the client machine can do a domain login. Now i want to know which client is the easiest to setup mail server (other than exchange). so my server pc can act as mail server. there is no internet involved in this model.