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(gnus)Mail Back End Variables

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Mail Back End Variables
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   These variables are (for the most part) pertinent to all the various
mail back ends.

`nnmail-read-incoming-hook'
     The mail back ends all call this hook after reading new mail.  You
     can use this hook to notify any mail watch programs, if you want
     to.

`nnmail-split-hook'
     Hook run in the buffer where the mail headers of each message is
     kept just before the splitting based on these headers is done.
     The hook is free to modify the buffer contents in any way it sees
     fit--the buffer is discarded after the splitting has been done,
     and no changes performed in the buffer will show up in any files.
     `gnus-article-decode-encoded-words' is one likely function to add
     to this hook.

`nnmail-pre-get-new-mail-hook'
`nnmail-post-get-new-mail-hook'
     These are two useful hooks executed when treating new incoming
     mail--`nnmail-pre-get-new-mail-hook' (is called just before
     starting to handle the new mail) and
     `nnmail-post-get-new-mail-hook' (is called when the mail handling
     is done).  Here's and example of using these two hooks to change
     the default file modes the new mail files get:

          (add-hook 'gnus-pre-get-new-mail-hook
                    (lambda () (set-default-file-modes 511)))
          
          (add-hook 'gnus-post-get-new-mail-hook
                    (lambda () (set-default-file-modes 551)))

`nnmail-use-long-file-names'
     If non-`nil', the mail back ends will use long file and directory
     names.  Groups like `mail.misc' will end up in directories
     (assuming use of `nnml' back end) or files (assuming use of
     `nnfolder' back end) like `mail.misc'.  If it is `nil', the same
     group will end up in `mail/misc'.

`nnmail-delete-file-function'
     Function called to delete files.  It is `delete-file' by default.

`nnmail-cache-accepted-message-ids'
     If non-`nil', put the `Message-ID's of articles imported into the
     back end (via `Gcc', for instance) into the mail duplication
     discovery cache.  The default is `nil'.