reply-to on this list not set

Hello, I've noticed something on this list, and I'm wondering if this is intentional or not. The reply-to value is not set by the list server. As a result, when people post to the list, sometimes when repliers hit reply, the reply goes back to the original sender only, and not the list. So some messages that are part of the thread may not be seen on the list. Is this intentional to keep down traffic? Alan