We are in charge of the postproduction of the movie.

I bought stamps at the post office.

I sent a postcard to my friend.

Could you tell me your postal code?

I sent you a postcard.

I sent important documents by registered mail.

There is not a single letter in my mailbox.

Please put the letter in the post office box.

I read the Letter to the Ephesians and gained a deep understanding of Christian teachings.