Postfix- transport map unable to retreive message/queue ID

Issue

• We need to trigger the script: mail_recipient.sh when messages arrives for a particular user
• With the script a number of arguments need to be passed
  • 1: Customer name (constant: CUSTOMER)
  • 2: Transmit code (constant: TCODE)
  • 3: Unique message ID of the Email generated by the MTA.
  • 4: Sender address
  • 5: Recipient Address
• The problem we have is the ${queueu_id} macro I wanted to use is NOT available in the version of postfix on RHEL v6.6
• Contents of master.cf:

myscript      unix    -       n       n       -       -       pipe flags= user=test argv=/pkgs/test/util/scripts/mail_recipient.sh CUSTOMER CODE ${queue_id} ${sender} ${recipient}