gnus: Unix Mail Box

 
 6.4.13.1 Unix Mail Box
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 The “nnmbox” back end will use the standard Un*x mbox file to store
 mail.  ‘nnmbox’ will add extra headers to each mail article to say which
 group it belongs in.
 
    Virtual server settings:
 
 ‘nnmbox-mbox-file’
      The name of the mail box in the user’s home directory.  Default is
      ‘~/mbox’.
 
 ‘nnmbox-active-file’
      The name of the active file for the mail box.  Default is
      ‘~/.mbox-active’.
 
 ‘nnmbox-get-new-mail’
      If non-‘nil’, ‘nnmbox’ will read incoming mail and split it into
      groups.  Default is ‘t’.