If you dream of a letter carrier arriving at your door with mail, brace yourself — news that is unwelcome or unsettling may be on its way. Hearing the carrier's whistle points to a surprise visit from someone you weren't expecting. If the carrier walks past without delivering anything to you, a sense of letdown or sadness may follow. Handing letters to the carrier to send suggests you could become entangled in someone else's envy or rivalry. Stopping to have a full conversation with the letter carrier warns that you may find yourself drawn into a situation that reflects poorly on your character.