How can I track a letter?

Question

I want to track a letter I am sending, so I know when the person receives the envelope. How can I do this?

Answer 1

through registered or receipt req mail

Answer 2

I think there's something at the post office that allows you to do that.

Just ask for it

Answer 3

you have to have a tracking number

if you have already sent it,

you would just have to call the person