Digests are a compilation of messages pertaining to a particular topic. They are particularly useful to users who prefer receiving one longer e-mail versus many small messages. Our digests are set up for delivery at least once a day, guaranteeing that messages won't be held longer than a few hours.
When subscribing to a mailing list, we recommend you choose the digest version. About 90% of our users prefer digests. However, if you would rather receive each message individually, you can change your preference at any time by unsubscribing from the digest form of the list and subscribing to the message form of the list. See the instructions for the list for details on how to do this.