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Gnus threads articles by default. To thread is to put responses to articles directly after the articles they respond to--in a hierarchical fashion.
Threading is done by looking at the References
headers of the
articles. In a perfect world, this would be enough to build pretty
trees, but unfortunately, the References
header is often broken
or simply missing. Weird news propagation exacerbates the problem,
so one has to employ other heuristics to get pleasing results. A
plethora of approaches exists, as detailed in horrible detail in
3.9.1 Customizing Threading.
First, a quick overview of the concepts:
3.9.1 Customizing Threading Variables you can change to affect the threading. 3.9.2 Thread Commands Thread based commands in the summary buffer.