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6.4.13.10 Mail Folders

nnfolder is a back end for storing each mail group in a separate file. Each file is in the standard Un*x mbox format. nnfolder will add extra headers to keep track of article numbers and arrival dates.

Virtual server settings:

nnfolder-directory
All the nnfolder mail boxes will be stored under this directory. The default is the value of message-directory (whose default is ~/Mail)
nnfolder-active-file
The name of the active file. The default is ~/Mail/active.
nnfolder-newsgroups-file
The name of the group descriptions file. See Newsgroups File Format. The default is ~/Mail/newsgroups
nnfolder-get-new-mail
If non-nil, nnfolder will read incoming mail. The default is t
nnfolder-save-buffer-hook
Hook run before saving the folders. Note that Emacs does the normal backup renaming of files even with the nnfolder buffers. If you wish to switch this off, you could say something like the following in your .emacs file:
          (defun turn-off-backup ()
            (set (make-local-variable 'backup-inhibited) t))
          
          (add-hook 'nnfolder-save-buffer-hook 'turn-off-backup)

nnfolder-delete-mail-hook
Hook run in a buffer narrowed to the message that is to be deleted. This function can be used to copy the message to somewhere else, or to extract some information from it before removing it.
nnfolder-nov-is-evil
If non-nil, this back end will ignore any NOV files. The default is nil.
nnfolder-nov-file-suffix
The extension for NOV files. The default is .nov.
nnfolder-nov-directory
The directory where the NOV files should be stored. If nil, nnfolder-directory is used.

If you have lots of nnfolder-like files you'd like to read with nnfolder, you can use the M-x nnfolder-generate-active-file command to make nnfolder aware of all likely files in nnfolder-directory. This only works if you use long file names, though.