How can I find out how many members are on my majordomo mailing list?

Electronic mailing list servers can be set to forward messages to subscribers of a particular mailing list either individually as they are received by the list server or in digest form in which all messages received on a particular day by the list server are combined into one email that is sent once per day to subscribers. Some mailing lists allow individual subscribers to decide how they prefer to receive messages from the list server (individual or digest).