Discussion List Invites

Hi I’m new on the Discussion Forum,
I am part of a group that uses DreamHost to host a number of Discussion Lists. It has been my experience that people are notorious for not accepting “Invites” to the Discussion lists. When I talk to them in person, they do want to join the list, and so I almost invariably end up “Subscribing” them instead. This requires no action on their part. Along the same lines, the front page of our website has a “join” link. Virtually no one has “joined” the email list by clicking on this link. I know this because we’ve set it so that administrators/moderators receive a notification when someone joins or leaves and I am an administrator.

My question is this:
Is there away to see a log or tracking history of who has been “Invited” regardless of whether they joined or not?

Thanks in advance.