A costumer had a windows2011 SBS server with exchange.
All the email is working fine. People can send and receive email. But.....
If someone wants to send an email from exchange to someone who is in the same email domain but not in exchange (popbox) there is an error.
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##
I know it hads to do something with relying, but i dont know how to fix it. Who can help?