Sort by Threads (strict)

Organize articles so they are displayed as a base article followed by each response article. Each response is indented in such a way as to show which article a person was reading when the response was made. This method of sorting uses only the references header for sorting, software that does not properly preserve the references header can cause broken threads. This option is only available if Threading was enabled when this group article-list was retrieved. See Configure Article-List.