I have written him a letter and would love to send it to him rather than boring ol email. I think a hand written letter is way better and means more than an internet sent letter. I found an address on one website but I'm not sure if it is credible. Thought I would ask here, maybe you guys can check it Out!
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Good luck with the address. I have no clue how secretive RA is or not. Many people forgo traditional adresses to fans nowadays.
But you are right that a handwritten letter is more personal, just no always necessary (it is not a job or a loved one).