bind for mailing list

[Kurt Hindenburg]

 I would like to bind 'r' to 'list-reply' when the message is from a 
 mailing list I'm subscribed to.  A catch-all one command would be nice.
 
       ~l              message is addressed to a known mailing list
 
 Should I use message-hook, folder-hook or what?
 
 # Hmm, don't think so... ~l is not a folder
 folder-hook "~l" "bind index r list-reply"
 
 # Doesn't work
 message-hook "~l" "bind index r list-reply"
 
 # Works of course for all messages
 bind index r list-reply
 
   Thoughts?