Instead of being sent each message that is sent to a mailing list, you can opt to receive a daily index or digest of messages.
An index will consist of a list of messages posted to the list and will include the subject and author of the message. You can select the messages that you are interested in and 'order' them from the server using the instructions in the index message.
A digest is single message containing all the messages posted since the last digest. It is not edited.
The following commands turn index or digest on or off for the specified list or all lists:
set listname | * digest | nodigest
set listname | * index | noindex
For example:
set law-criminaljustice-l digest
set * index
set maths-gametheory-l noindex
Note: you cannot have index and digest set at the same time. Setting index will override digest and vice versa.