Lots of recipe fans on Postcrossing! People offer them for swaps or lotteries often.
There’s a tag you can join that sends recipe cards
https://community.postcrossing.com/t/postcard-recipe-tag/32101/23
And there are a number of threads devoted to recipes too - enjoy!:
https://community.postcrossing.com/t/cooking-recipes-from-postcards/1922
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