I have a problem with SMTP Auth and Relaying.. does anyone have any pointers? What it is is that I have users offsite that are accessing exchange, and when they send email, it says "Unable to relay for jay@xxxxxxxxxxxxxxx".. They are trying to send a message TO that address, and they have their from address correctly setup.. I don't know what to do.. The only thing that has worked is opening the server as an open relay, because even if they do SMTP Auth, it still gives them that message, and I have the allow to relay when the computer authenticates checkbox checked.. HELP Jay