Actual or imagined communication.
Receiving mail in a mailbox can represent the idea of receiving communication from someone, whether you want it or not (since you have no say over what gets put into your mailbox).
Mailing a letter can represent something you’d like to say to someone else (written, spoken, etc.), a message you’ve sent in real life, or one you’d like to send.
See Also: Letter(Message)
[1]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.
[2]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.
[3]1. Hearing from God
2. Invitation;
3. A dream or Vision coming;
4. Written communication; 1 John 5:11; Matt. 13:19.
[4]Symbolic of someone or God wanting to send you a message
[5]