My problem is:
I have a Exchange 2010 installed in hosting mode.
I have 6 companies using this server with 6 different domains. The users of each domain can send and receive emails from and to domains on the internet.
The problem is that they cannot send to each other, e.g. User@domain3.dk sends a email to email@example.com, the mail dont get through and the following error is received:
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
I rember at some point having made a change so this was working for the first domains that I created a long time ago, but I just not able to find how I did in my notes, so this is a problem everytime I create a new company/domain, :-(
The 2 first companies that I aparantly fixed this on are not able to send to the new domains either, but they can still send to each other.