If you were a letter how would you get to the address on your envelope? Maybe you'd cycle or walk, or perhaps catch a ride in a van. The easiest way is to let New Zealand Post look after you. Why? Well, we get millions of letters to the right place every day. Let's go on a journey with a letter you've written, perhaps to your friend, to find out how! Before we set off there are a couple of things that you - the sender - have to do.