A postman stands for news on its way and messages arriving. Folk tradition reads him as something long awaited coming to your door, whether wanted or not.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.