@Ethan The error "Domain someplace.com not found" notice/error you saw on
this MS post indicates there's no record in MS of a "someplace.com" domain, not that it's not found in the post. In such situations, you can create the domain record for the "someplace.com" domain first. This can be done from page you get to form clicking "Tools" -> "Domain" and then clicking "add a new domain" to get to the
Create Spam Domain page.