MacSOUP is an offline reader for Usenet newsgroups and Internet e-mail. If you don't know what newsgroups are, you probably don't need this program. MacSOUP is primarily a newsreader, its e-mail capabilities are somewhat rudimentary compared to "real" e-mail clients.
MacSOUP is shareware ($20). See the Order page for details.
The current version of MacSOUP (2.8.4) is compatible with Mac OS X 10.5 through 10.9.