When users are at home they get mail from our Exchange 5.5 server using OWA. When they get an email from someone outside our domain, they are not able to reply to that person. I know that it is because I have not allowed relaying on our Exchange server, but is there a way to allow specific user to be able to relay if I know their external (home isp) email address? Or would my only option be to allow the mail server for the isp to relay? Thanks.