Majordomo, like other listservs, can greatly reduce the maintenance of a mailing list for the list owner. The e-mail addresses that are entered into the list are usually correct, so the amount of editing is decreased. Changes to an e-mail address are fairly easy to make in an open list by unsubscribing the old address and subscribing again with the new address. In some cases, however, the list owner may decide that subscribers and unsubscribers have to be approved . These lists are called closed lists.
Automation can provide some other services for subscribers and list owners.
In some cases, to avoid pushing dozens of e-mail messages a day on subscribers, list owners can provide an alternative digest of several messages. The digest is shorter and can be managed more easily. Of course, if the intention of the list is to be more of a discussion than a news bulletin, a digest may be inappropriate. Sometimes list owners want to control the messages that are posted to their lists. It is up to them.