If the by digest option is used, only digests are stored, on the day they are distributed. By Digest Archive file names will reflect the week of the month they are distributed, in the format listname. Monthly Archive file names will reflect the month distributed, in the format listname. By Digest Archive file names will reflect the volume number of the digest each file contains, in the format listname. VV where VV indicates the digest volume number.
Subscribers only restricts access to list subscribers.
Owners only restricts access to owners. All allows anybody on the Internet to retrieve files from the archive. The archive password need not be the same as the list password, and in fact should not be the same. These settings specify defaults for subscriber preferences. Subscribers can manually set these as well using the list processor's SET command.