Sending letters to corporate executives will rarely provide a response or a reading.
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I wrote a letter to Michael Eisner 15 years ago. I received a very kind reply from his office. During my next visit to Walt Disney World, I was welcomed by a VIP guide and could visit the Magic Kingdom backstage area including the tunnels, the computers room,... And we received 4 free tickets. I sent my letter to Walt Disney World and it was forwarded to Michael Eisner office in Burbank. That was pure Disney magic.