The post
Is there one waiting for you?
Give us the address someone would have used. If something's here, we'll post you a six-character key to open it with.
1 sealed
Something's here for you. Key sent — it's good for ten minutes.
The seal breaks once. Make sure you've got a quiet minute before you open it.
We'll only answer yes or no. We won't say who it's from, when it was written, or whether you've been sent one before — and we don't keep the question either. If there's nothing here, there's nothing here, and we forget you asked.
Nothing came back?
Letters are addressed to one exact address, so a different inbox won't find it. Worth trying the one you'd have given someone years ago — and it's also entirely possible nobody's written yet. That's fixable from the other side.