Carnival has requested that guests not email the Maitre D (unless there is a public list out there from an official Carnival source I'm not aware of). This was recently confirmed by Mr. Heald along with the request to just post on his FB page and he would send the info along. Maitre D's are not required nor expected to respond to guest emails. So emailing might get your request honored, or might not. Same with John. He just forwards the request, but always specifies that he knows the Maitre D will do their best.