Can't add Exchange contacts to email distribution list.
I'm using Exchange on SBS 2011. For some reason I can't add Exchange contacts (external email addresses) to Exchange distribution groups in the Small Business Server console. The funny thing is that I CAN do it if I use AD Users and Computers, but the contacts in the group never receive the email. I can email contacts if they're not in a distribution group. I think that the contacts won't work until I figure out why they can't be seen in the SBS console when adding users to distribution groups.
I've rebooted the server and made sure there are no mail flow restrictions when setting up the distribution group.