Is it possible to stop the repeated addition of RE:[listname] to the front of the subject title everytime it is answered? just leaving one?

Here's the recipe I use:

# # rc.local.s10 #

# # Insert the list name into the subject field (if not already there) #

:0 fhw * $ ! ^Subject:.*[$list] * ^Subject:/.* | formail -I "Subject: [$list]:$MATCH"

This recipe won't add the listname if it's already anywhere in the subject line.

-Cary Coutant