mh-default-folder-list

mh-default-folder-list is a variable defined in `mh-e.el'.
Its value is

nil

Documentation:
*List of addresses and folders.

The folder name associated with the first address found in this
list is used as the default for `mh-refile-msg' and similar
functions. Each element in this list contains a "Check Recipient"
item. If this item is turned on, then the address is checked
against the recipient instead of the sender. This is useful for
mailing lists.

See `mh-prompt-for-refile-folder' and `mh-folder-from-address'
for more information.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 7.2 of the MH-E package that is part of Emacs 22.1.