I'm not sure if it is an annual thing, but I remember that Epcot had a special mailbox last December when my son and I visited. I know that the mail deposited there received a post mark that either said Epcot or WDW. Maybe a recent visitor knows.
As far as I can remember, the post mark is Lake Bauna Vista, FL.
We are planning on doing the same thing, mail Christmas cards from WDW. I picked up the "disney friends" stamps that came out a few months ago at the post office, and have been saving them just for this occasion.
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