The junk newsgroup contains all the postings which the news transport
can't file under a newsgroup name.  These can include malformed postings
(either as result of human, software, or transmission error); postings to
bogus groups; postings to groups that have been deleted; postings to new
groups that you haven't added yet; and postings to groups that you don't
carry at your site, and don't intend to.

Some admins see it as friendly to transmit junk to your neighbors, to cover
the latter two cases.  However, common practice is to expire junk almost
immediately afterwards.

If you're getting lots of postings in junk, it may mean that the combination
of your sys file, your active file, and your neighbors' sys files, are not
doing what you intend them to.

Some parts © 2009 Advameg, Inc.