US Patent 7843593 Restricting replies to communications

A method of communication is disclosed. The method starts by receiving a document and a destination communication address from a first user device. A unique number associated the first user device is allocated and recorded in a pending reply list. The document and the unique number are then communicated to the destination communication address. Upon receipt of a received document and a received reply number, the method performs the additional steps of: determining whether the received reply number matches an entry in the pending reply list, and delivering the received document to the user device associated with the unique number matching the received reply number.