An email, containing list of all the subscribers of the selected list, will be sent to the maintainer of the list.
You may have the log of all actions performed by the list sent to the list maintainer.
You may delete the current log.
A list of all subscribed users satisfying the matching criterion can be mailed to the Maintainer of the selected list. Note that test, testuser, and new_test would all be included in a search for test.