Dreaming of a mailbox indicates expectation. You may be waiting for a package to come or to receive news from a friend. Alternatively, you could be excited about something in your waking life and have great expectations about what is to come. Examine the condition of the mailbox to determine how you’re feeling in regards to the expectation. A new, clean mailbox could indicate joyous and excited feelings whereas a mailbox that is dirty or old could indicate feelings of anxiety, tension or nervousness.