Disclosed is a receiving apparatus and method, a sending apparatus and method, recording medium, and a communication system for sending or receiving electronic mail. In operatively associated with a command for opening an electronic mail message, a syntax analysis module extracts a script attached to the electronic mail message as an attachment file and analyzes the syntax of the extracted script. An execution module executes processing corresponding to the data accompanying the script or an input event. An output module controls the outputting of the results of this processing. With this configuration, a sender of electronic mail is allowed to make its recipient to quickly and securely take actions desired by the sender.