He treats us as a big friend.

I will send you a postcard.

Okurigana is an important element in understanding how to write in Japanese.

I bought stamps at the post office.

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 posted a letter in the mailbox.