In our configuration we publish courses at the default organization, then create child orgs for our Customers along with their own admins for their learners.

Whenever someone uses the "Contact" link to message the admins at the default organization, all child admins intended to receive messages only from their own organization also receive this message.

If a learner within a child org and custom portal uses their own "Contact" link, it does only message their own admins as expected, but we cannot use this functionality when those admins are also receiving messages from learners outside of their organization.