Once, the mathematician Donald Newman(1930-2007) was struggling hard with a problem, but couldn’t resolve it by any means. He went to sleep at night and had a dream. This was not the kind of dream which gives the solution to a problem, but a dream in which he met fellow mathematician John Nash. Newman asked Nash about the problem, and Nash told him the answer. When Newman finally wrote the paper, he gave credit to Nash. (I’m not kidding, read the story in this book or in the Scientific American ).
Every letter that is sent to someone, whether by email or by surface mail, is also an exchange of forces on the inner planes, which can be detected by someone who has become conscious of his inner being (i.e. astral body).