Complete manual/406/en

Closed: Another option is to keep your mailing list closed. In a closed list, membership is limited, and all subscribers require approval before they can join the list. It may also not be possible for people to even request membership in the group. It's also possible to have a list that is publicised (i.e., everyone can know it exists) but to still have it closed. This type of list is useful when you want to discuss sensitive or personal topics and want to be sure that all members on the list are known and considered trustworthy by their fellow members.