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The flow of items from one USENET site to another is called a newsfeed. A newsfeed replicates items in newsgroups between host computers. One or more servers, or hosts, running NNTP make up a USENET site. Note that a USENET site is different from a Microsoft Exchange Server site.
Each USENET site receiving a newsfeed can be configured to accept and generate an NNTP connection and newsfeed. The host computer that receives your newsfeed is configured as the outbound host. The host computers that provide your newsfeed are configured as the inbound hosts. A host computer can be configured as both the inbound and outbound host.
The following illustration shows how the Internet News Service exchanges items in newsgroups with other USENET sites: