mh-recursive-folders-flag

mh-recursive-folders-flag is a variable defined in `mh-e.el'.
Its value is

nil

Documentation:
*Non-nil means that commands which operate on folders do so recursively.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 7.0 of the MH-E package that is part of Emacs 22.1.