I don't have an exit.
My answer to that question is always, No.

But when asked to make it happen, we have certain lists that are always
updated - so new subscribers are added and any unsub'd subscribers
automatically get put back on. No one bothers to signoff...

-- Trish

On Wed, 5 Nov 2003, Paul Russell wrote:

> subscription is, in essence, mandatory. I have been explicitly asked
> whether it is technically possible to prevent subscribers from leaving
> these lists. Has anyone implemented a list exit to either prevent
> signoff or require owner approval for signoff?