mh-inc-prog

mh-inc-prog is a variable defined in `mh-e.el'.
Its value is

"inc"

Documentation:
*Program to incorporate new mail into a folder.

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. You'll then need to modify
several scan line format variables appropriately.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 6.0 of the MH-E package that is part of Emacs 22.1.