CCtoMany list owners receive a report by email each Saturday containing statistics about their list. This is an example of that report for a discussion list:
disclist weekly report, generated Sat May 7, 2016 at 02:51 AM PDT Please bookmark our customer support blog: http://support.databack.com Subscriber count (including subs/unsubs below): 24 New subscribers past week: 0 Unsubscribed past week: 1 email@example.com Removed after two bounces: 0 Mailings this month: 2016-05-05 09:14 post from firstname.lastname@example.org
Normally a report is sent every Saturday, even when there has been no change or activity on the list. List owners may request that reports be suspended completely, or request that they be sent only when there is activity on the list (and on the 1st day of the month regardless).
Activity is defined as a new subscriber added, a subscriber leaving, a message posted, etc.
One caveat: "activity" also includes a new subscriber being sent a confirmation message. But if that potential new subscriber does not respond and complete the subscription, he won't be listed as a new subscriber in the daily report. In other words, it is possible that the list owner might request to receive only "activity" reports, but then occasionally get one which shows no activity, because a confirmation was sent without a response.