6.8.1 The NNDiary Back End

nndiary is a back end very similar to nnml (see section 6.3.13.3 Mail Spool). Actually, it could appear as a mix of nnml and nndraft. If you know nnml, you're already familiar with the message storing scheme of nndiary: one file per message, one directory per group.

Before anything, there is one requirement to be able to run nndiary properly: you must use the group timestamp feature of Gnus. This adds a timestamp to each group's parameters. 2.19.3 Group Timestamp to see how it's done.