Disassociate an authenticated domain from a given user.

**This endpoint allows you to disassociate a specific authenticated domain from a subuser.** Authenticated domains can be associated with (i.e. assigned to) subusers from a parent account. This functionality allows subusers to send mail using their parent's domain. To associate an authenticated domain with a subuser, the parent account must first authenticate and validate the domain. The parent may then associate the authenticated domain via the subuser management tools. Note that if you u...