I'm pretty sure it is triggered by going over a certain threshold of bounced messages within a short period of time. This happened to me occasionally when I was using a different (non-Gmail) address for all my list subscriptions.
On Thu, Apr 17, 2008 at 9:45 AM, Bob Amstadt <
bobld@amstadt.com> wrote:
The list server unsubscribed me without me requesting it to do so. Is there something going on with it?