Oh, wow.
Amazing.

"I write undelivered letters

for undelivered chances"

That's just spectacular.

I think, though, that it might work better if you added a period after "undelivered chances" and started a new sentence with because.
It really doesn't make much of a difference, but I'm trying to concrit instead of just gush about how much I love it.
Fantastic job.

I like this piece, the title is interesting. I also like the ending because it asks a great question and the answer is interesting. I also like your word choices, very powerful.

PS If you're bored today check out the Review Game and its Review Marathon (link in my profile)