Zendesk hides and loses CC field

When sending an email to Blue Apron support, it gets routed to ZenDesk, but when it does, it loses the CC info, such that replies go only to the original sender and the support agent doesn't see the email that was associated with the request, so they have to ask for it specially.

No files, tests, or entry points are identified in the issue. Start by locating the email-to-Zendesk routing integration and trace how CC recipients are passed; done means the CC information remains visible in Zendesk and is included when support replies.

Written by the indexing model from the issue text.