hey experts i am getting crazy here i cant connect my internal pc and neither external pc to my exchange server through outlook express i have configured the following my iis is listining to the internal ip and port 80 my protocols in the mail exchange manager pop3,smtp,imap is also listining to the local ip my router nat table is added xxxxxx--------iiiiiiiii:25 xxxxxx--------iiiiiiiii:80 xxxxxx--------iiiiiiiii:110 xxx=external IP iiiiii=Internal IP note : i can connect from outside using(real IP\exchange) AND internal using(local IP\exchange)with normal OWA but the outlook express not at all what is my mistake -- Eng.Mohamed Gomaa GIS Application Engineer Intergraph Egypt