I have netware 6.5 sp7 with groupwise 8.0.2 and I have disable relay with disallowauthrelay and try to use the access control to prevent relay except for one of my student system server and I getting relay dennied error. Is there any way where I could disallow out side people access my smtp server from authenticate to it and send email out but allow only one server to pass this exception by able to relay to send message out.

I lighspeed spam filter which is not a store and foreward box and it would cost me money to buy one because my currrent system do not do a store and forward to prevent people access my smtp from the outside.

Is it possible to block smtp port 25 on gwia. my concer would be that we will not receive due to no having a store and foreward box.