We are just setting up a Windows 2003 Standard server and are converting alot of our Linux duties over to it. We've got the webserver working already and are getting ready to work on an email server. I've turned on the Pop3 service and my computers is holding open both the smtp and pop3 ports. Are my Active Directory users already setup to send and receive email? Do I have to add users to the pop3 management screen even though they exist in Active Directory.