The mailman in a dream refers to being restless from doing day-to-day activities, being bored with your community, feeling lost, unsatisfied, and loathing your life. This can be because you’re stuck in the routine of your current job or because you’re dissatisfied with the direction of life and a lack of motivation to take the necessary steps to get yourself into a better position.
It shows that there maybe power if we stop waiting around for the mailman in our dream and instead take immediate action and responsibility for transforming ourselves into a better version than yesterday. In short, take action and don’t wait around.