Well heres the problem, I have a server mail.whatever.abc, and there is a windows domain in the system where i work. The domain is similar but not the same as the domain for my server. If the computer is log regularly - with the domain part - I can configure the the outlook completely and haver it working fine. But if the computer is login to its coresponding domain, i can only send internal mail but i cant send anything going out like, @yahoo.com @hotmail.com. It will report an relay sending error. Thanks hope someone can help me.