If you are about to be married, or if you plan to get married, and you doubt whether you should go through with the marriage, especially if you get a bit emotional about it, then this dream could be an emotional restoration dream. In such a case it is not a warning. The dream just exposes or reveals your emotions.
If you are not at all worried or not emotional or not in doubt, then this dream is probably a message from God the Father (the piece of paper that has a similar meaning as a letter or an envelope which represents a message from God) which means that this is a warning not to get married.
Did you pray for a friend or pondered on a friend who is about to get married? Then this dream is probably not about you but about that friend.