Mailing list members are persons that receive bulk email messages, such as weekly or monthly newsletters. Based on the mailing list management software that is used to manage a certain list, they may have signed up personally, giving their categorical approval to be part of the mailing list, or they may have been added manually. The latter means that they will de facto get unsolicited messages. Basically, member list subscribers can be managed by the mailing list owner who can add or delete them, or they can manually unsubscribe if they do not want to get messages in the future. All mailing list subscribers will invariably receive the very same content as long as they belong to the same mailing list, but a single member will never be able to see the rest of the mailing list members in the "To" section of the message.