What port are you using? 587? Is the firewall allowing traffic on this port.
I think this is not a NPrinting related question. Try to setup Outlook on NPrinting server first with account you want to use.
cheers
Lech
cheers Lech, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful to the problem.