As above really, i have a 2003 sbs with exchange 2003 SP1, and i can receive emails but just not send them , they go into sent items but wont leave the server. i can telnet to port 25 fien so i dohnt think its that, i also changed port to 26 with no affec, i dont use smarthosts, my isp is Orange, and i use no-ip to static my address? any help would be great? thanks Dan