Many, many years ago, when email was a new and exciting thing, I wrote to two authors that I admired very much, and they both wrote back :)
One was Jeanette Winterson, and the other was Douglas Anthony Cooper.
I'd read an article by JW and wrote to her basically saying I agreed with what she said, and she replied (literally immediately - she must have been checking her email when it came in), which I was rather chuffed about.
And DAC was similar - he replied really quickly on the same day, saying my email had cheered him right up as it happened to be his birthday on that day :)
And even longer ago than that, when I was in my late teens, I wrote to Jeremy Paxman and he wrote back (on BBC letterhead stationery, I'll never forget).
Oh and I've just remembered another one - I emailed the children's author Malachy Doyle about 10 years ago to tell him how much DS1 and I enjoyed Owen and the Mountain, and asking something about the book that DS wanted to know. He wrote a lovely email back, answering the question.
So have you, who to, and did they write back?