Abstract: A spam detection system employs a “Delayed-Verification on Purported Responsible Address” (DVPRA) module which verifies the validity of the return address of a received e-mail message in mail server in a time delay interval specifiable by the user. An implementation of the module as a Spam Mail Filter in a stand-alone spam detection system. An implementation of the module as a supplementary to the existing anti-spam systems.

Abstract: Methods and systems for creating a full-featured, individually customized email system by allowing end-users of an electronic mail system to extend standard electronic mail protocol for the creation of user-defined commands that are recognizable and executable by an electronic mail system and that can alter processing performed after a server accepts a piece of electronic mail. Routine events are raised during the communication of information and processing of data that give rise to the execution of registered commands. The commands are registered in an event-binding database and include standard commands and user-defined commands that are executed according to priority.

Abstract: A data protection portion includes the file alteration checking portion. One aspect of the file alteration checking portion relates to a media including game content and a data protection portion. In one version, the data protection portion protects the game content from modification by determining whether the game content has been modified. If the game content has been modified, then the installation of the game content within the apparatus fails.