Otherwise, it is filed to the special group junk . Each newsgroup has a separate directory, in which each article is stored in a separate file. Apart from storing articles locally, you may also want to pass them on to outgoing feeds. This is governed by the newsfeeds file that lists all downstream sites along with the newsgroups that should be fed to them. Instead of doing all the transport-specific handling itself, innd relies on various backends to manage the transmission of articles to other news servers.
Outgoing facilities are collectively dubbed channels .
For an outgoing UUCP feed, on the other hand, it might write the article's size and file name to a special logfile, which is head by a different process at regular intervals in order to create batches and queue them to the UUCP subsystem. Besides these two examples, there are other types of channels that are not strictly outgoing feeds. These are used, for instance, when archiving certain newsgroups, or when generating overview information. Overview information is intended to help newsreaders thread articles more efficiently. Old-style newsreaders had to scan all articles separately in order to obtain the header information required for threading.