The '[Import_FIDONET.NA]' stanza tasks MUTIL with running a function that will bulk auto create a number of message bases in Mystic for you. It look to a text file that you specify that is formatted with echoarea tag and a description of the message base.

Mystic then will create the message bases contained in this file en-mass and quickly!

Here's an snippet from a .NA file set up for Fidonet echoareas

MOVIES              Movies & TV Discussion
MUFFIN              Maximus BBS Discussion And Support.
MYSTIC              Discussion and chat about the Mystic BBS software
NET_DEV             Fidonet Network Development
NFL                 National Football League scores, discussion, etc. 
NHL                 The National Hockey League Discussion Echo

To enable this function you modify the '[general]' stanza as follows:

[general]

Import_FIDONET.NA       = true

There a several switches you can configure that relate to this function.

The filename to read when running the import process.

; filename to import
  filename = fidonet.na
  

Should Mystic convert echoarea tags to lowercase?

; convert tags to lower case for message base filename  1=yes
  lowercase_filename = 1