DSN and MDN might have great value in a closed environment such as a corporation which has complete control over all of its mail clients and servers. For open environments such as a the Universitythere is no way to guarantee any reliability, and so the use of these mechanisms is discouraged. Message Filtering for Newsgroups Message filtering is a tool which can help users who read newsgroups that contain a large number of new messages on a daily basis. Rather than reading through all the new messages one by one, filters can be used to highlight specific messages or threads of interest automatically. They can also be used to ignore or hide message threads of no interest.
Filters are especially useful in avoiding spams.
Give the new filter a name that will give you an idea of what it does. Select which message header you would like to scan. Communicator can search through the subject and sender fields of message headers. Enter the text for which you would like to scan. Tell Communicator what action to take when it applies a filter.