So I have created a contact, and setup the AD user, to forward + store email to the contact created. The contact is a domain outside the domain hosted by exchange 2003. However when sending a test mail, I recieve the following error :
#< #5.5.0 smtp;551 This is not a relay host - mail must be to or from host domain.> #SMTP#
I dont get it, it shouldnt be relaying the email, just forwarding. Any tips? do I need to add something to the SMTP gateway?