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(mh-e)Customizing Incorporating

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Incorporating Your Mail
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   The name of the program that incorporates new mail is stored in
`mh-inc-prog'; it is `"inc"' by default.  This program generates a
one-line summary for each of the new messages.  Unless it is an
absolute pathname, the file is assumed to be in the `mh-progs'
directory.  You may also link a file to `inc' that uses a different
format (see `mh-profile'(5)).  You'll then need to modify several
variables appropriately; see `mh-scan-prog' below.  You can set the
hook `mh-inc-folder-hook', which is called after new mail is
incorporated by the `i' (`mh-inc-folder') command.  A good use of this
hook is to rescan the whole folder either after running `M-x mh-rmail'
the first time or when you've changed the message numbers from outside
of mh-e.

     Rescan folder after incorporating new mail via mh-inc-folder-hook
     
     (defun my-mh-inc-folder-hook ()
       "Hook to rescan folder after incorporating mail."
       (if (buffer-modified-p)            ; if outstanding refiles and deletes,
           (mh-execute-commands))         ;   carry them out
       (mh-rescan-folder)                 ; synchronize with +inbox
       (mh-show))                         ; show the current message
     
     (add-hook 'mh-inc-folder-hook 'my-mh-inc-folder-hook)