how do I bounce "message too long" back to the sender instead of to listowner?

["Thomas Hanson" <klon @ nybro . dk>]

Title: Message

We have a limit on all of our internal mail lists, and nothing that is larger gets approved. Therefore, We would like to bounce "Message too long (>51200 chars)" messages back to the sender instead of the mail list owner, all other forms for posible approval must continue to go to the list owner. Can this be done ? if so how?

 

Thanks

Thomas