in general , in one aspect , one embodiment of the present disclosure features a message delivery method . the method includes the steps of receiving a message including delivery instruction and delivery information indicating a time at which the message is to be delivered to a communication device of a recipient ; storing the message ; and delivering the message to the recipient at a time indicated by the delivery information . further , the delivery instruction and the delivery information are set by a sender of the message . other embodiments are also provided .