She checked her 'mailbox' daily, hoping for a letter from her son.
On the way to work, I dropped my letters in the corner 'mailbox'.
an electronic 'mailbox'
(..) Good, good. There is no William Parcher. Of course there is. I've been working for him. Doing what? Breaking codes? Dropping packages in a secret mailbox for the government to pick up? How could you know that? Sol followed you. - He thought it was harmless. - Sol followed me? (..)2001 A Beautiful Mind