[exim] have a script running when mail received

I need a script to process the latest email received So far I added this to /etc/exim4/exim4.conf.template from infos I gathered on the web and in the manual but  I am not sure if this is correct nor if  it this is supposed to be added to 00_exim4-config_header

the plan is to run a python script that will process the email content everytime the machine receives a mail

...
...
### router/mmm_run_script
#################################
# process received emails

runscript:
  debug_print = "R: localuser for $local_part@$domain"
  driver = pipe
  domains = +local_domains
  data = /var/mail/mail
  file_transport = address_file
  local_parts = localuser
  user = localuser
  group = mail
  command = /some/path/to/some/command with some options
  maildir_format

#####################################################
### end router/mmm_run_script
#####################################################
#####################################################
### transport/00_exim4-config_header
#####################################################

######################################################################
#                      TRANSPORTS CONFIGURATION                      #
######################################################################
#                       ORDER DOES NOT MATTER                        #
#     Only one appropriate transport is called for each delivery.    #
######################################################################

# A transport is used only when referenced from a router that successfully # handles an address.