The digest option can be activated by doing the following (this info is from the Museum-L FAQ page):
With the DIGEST option ON the LISTSERV software will send one large message per day from the Museum-L discussion list. This single message contains a simple table of contents and the full text of the day's messages. The DIGEST is distributed shortly after midnight local time. If you would like to switch to the DIGEST option send the following in the body of an e-mail message to: [log in to unmask]
SET Museum-L DIGEST
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Important Subscriber Information:
The Museum-L FAQ file is located at http://www.finalchapter.com/museum-l-faq/ . You may obtain detailed information about the listserv commands by sending a one line e-mail message to [log in to unmask] . The body of the message should read "help" (without the quotes).
If you decide to leave Museum-L, please send a one line e-mail message to [log in to unmask] . The body of the message should read "Signoff Museum-L" (without the quotes).