Hope this is an easy one. We have a fairly simple setup - 1 domain, 1 Exchange 2010 server. Our internal domain let's call ourdomain.com. Our email addresses however are all @mail-ourdomain.com. So when one internal user emails another internal user, its sent through the smarthost. This causes a delay and occasionally an interoffice email caught by our ISP's spam filter. What do I need to change on the Exchange 2010 server so it knows its responsible for @mail-ourdomain.com instead of just ourdomain.com?