In general: If a dream trades of the fact that the dreaming receives a greetings card, then this is a tip to the fact that he must lead a certain kind of conversation with the sender. Maybe it is a matter of celebrating own luck or a happy fate chance with him. Psychologically: It can be that the subconsciousness of the dreaming concern about own matters or about the other people releases. Spiritually: At this level the greetings card in the dream is means of the visual communication and represents as such the ability to transmit a message spiritually.