I have setup a new Exchange 2013 server. The idea is to migrate everyone onto this new server. I have most people currently on 2010 and a test account on 2013. I cannot send messages to users on the other server. I get the attached from delivery reports.
Do i need to setup a send connector? I have done that and it didn't seem to help.
I have 1 x 2010 box and 1 x 2013 box