Is your list open subscription or limited (subscribe by owner)?  If it is open
subscription, then there is nothing to prevent a spammer from joining, doing
a review of the list members, and then leaving the list.  He then has a list of
potential "fresh" email addresses to sell to those folks who make their
money sending out spam.  If your list has restricted membership, then it has
some protection against this type of user - especially if you require some
type of explanation from the new member before adding them to the list.
This is probably the primary reason that people keep their member lists
restricted and don't mind the occasional, "who has Joe's email address"
types of posts.

On 25 Oct 2001, at 15:45, Mike Yuhas wrote:

> I consider myself a conscientious listowner, and I have made the
> conscious decision to allow subscribers (only) the ability to review
> listmembership. New listmembers are told (in the welcome message) how to
> conceal themselves, and how to use the review command to find an address.
>
> The intent is to curtail distribution of messages like "can someone
> please tell me Douglas Winship's email addy?"