To see a mailbox in your dream, represents important information that you are about to receive. Try to examine what meaning this dream may be trying to send you from your unconscious.
If the mailbox is full, then it indicates that you have not accepted these messages.
[1]1. Hoping for good news.
2. If box contains mail and the door or flap is open, it indicates good news.
3. If door is closed, bad news.
[2]1. Hearing from God
2. Invitation;
3. A dream or Vision coming;
4. Written communication; 1 John 5:11; Matt. 13:19.
[3]Symbolic of someone or God wanting to send you a message
[4]