RENEWAL processing has its pros and cons. On one particular list that I
used it, folks were replying back to the list and not the LISTSERV. That
generated MORE replies from the other subscribers. it was a vicious (or
it viscous ;-)) cycle.
Of course, as we all know, email addresses can and do change. Thus,
though a subscriber is able to RECEIVE email, they can not alter their
own subscription e.g., CONFIRM.