Ack: check this box to report on whether or not subscriptions are set to receive an "acknowledgement" message when they post to the list. For example:
Your message dated Thu, 2 May 2002 16:08:28 -0400 with subject "My message" has been successfully distributed to the MYLIST list (123 recipients).
See also the "Repro" setting.
See the LISTSERV Manuals for complete documentation.