Woman1: I mail the letters. Sometimes I mail parcels to my friends may be in China or in the USA.
Woman2: I find the post office very useful to me. I go there most, almost everyday.
Woman3: Um, well, the only ones that I've used are sending parcels.
Woman4: You can send letters priority post. You can send them registered mail so you can always know where your letter is.
Woman5: Everything; I mail letters; I mail parcels; and use it money orders.
What does "priority post" mean?
Express or first class or registered mail?