I doubt that will do it for cancelling an account, cf. Emirates' conditions I quoted. I could call with same question I asked here and probably get a reply, indeed, but when I first posted I had no access to a phone and had already spent some time on the Emirates site to find an answer that didn't involve writing an actual letter or sending a card back. Anyways, I'll write here how it eventually goes, so at least the forum archives will yield a reply.