Hello Experts . My site has two servers both with windows 2003 server 64 bit. the domain controller is server 2 and the exchange server is server 1. So my problem is this. I created a distribution group - universal on server 2. And then created a mail enabled distribution group on server 2 using the same details. the new email address is there for email@example.com
I can send to this address and the group members receive the mail from within the network. However external senders get the error message below when they send to that address. This distribution group was created the same way as another one - firstname.lastname@example.org. There is no problem with the second one.