Ok I'm trying to do all the testing needed before going live on a new sbs machine. email out works great after some snags with the isp, however when i try to send mail to it via username@ipaddress (havent moved DNS entries yet, still testing afterall) seconds later i get the 550 7.5.1 'unable to relay' from my exchange box at work (other is for church) and also from my gmail account. So its either isp or the box its sending to...i can telnet over pt 25 just fine. so i thought either i'll beat my head against a wall or i'd post a thread, so heres the thread...any takers?