[Mailman-Users] How to change subscriber address

[Mailman Users]

Earlier, Mark Sapiro wrote:
> 
> Mailman Users wrote:
> >
> >The web page http://system.name/mailman/options/listname
> >shows a place to enter a new address.  This does not actually
> >change the user's subscription address.
> >
> >What do I have wrong here?
> 
> 
> Submitting an address change causes a confirmation request to be sent
> to the new address. This confirmation request must be received and
> acted upon before the change is effective.

I'm not getting a confirmation request to the new email address,
and am not seeing a moderator action request either.  

I've seen this behaviour on another Mailman list, ver 2.1.6 - so I assume
there must be something I've missed on the configuration?

    - Charlie