Dreaming about receiving letters, just like in daily life, usually represents receiving news, information, or messages from someone specific, or from the world in general.
If you are the individual that looks forward to mail, this dream may have positive connotations for you. However, if you dread the envelops which typically hold the monthly bills, then this dream may have negative and anxiety provoking meaning for you. Typically however, dreaming about receiving letters has positive, and at times spiritual connotations. You may be coming into awareness about some aspect of your life, where you make new realizations and get to the “truth” of things. Some believe that seeing many unopened letters in your dreams, may represent missed opportunities.