When anyone tries sending an email to any contact that is in our AD with an external email , we get a bounceback You do not have permission to send to this recipient.... #5.7.1 smtp;550 5.7.1 unable to relay for external@domain.com This is becomming frustrating as I dont see any problems with our setup. These contacts are for reports from our system and they only have their smtp address with an x400 entry under email address. Would this be at the clients end - as they all bounce back from the same domain- even though the message comes from our server. Thanks CR