I feel like what I'm about to suggest must have been thought of: is it possible for me to somehow attach a "one time crackable key" such that if someone wants t

I feel like what I'm about to suggest must have been thought of: is it possible for me to somehow attach a "one time crackable key" such that if someone wants to send me an email, they have to do a nontrivial amount of calculation? Like... a turing email address, where they have to compute the actual address, and the computation is nontrivial?