Mailing list members are individuals that have joined a given list to get periodic email messages, such as weekly newsletters. In case the mailing list management software that is used to manage the mailing list permits it, you can also authorize members manually, but in this case such email messages may be regarded as being unsolicited and reported as spam by the users. Ordinarily, these members can unsubscribe from a mailing list by clicking on a hyperlink in the emails they get, or you, being the mailing list moderator, can manually delete them in case they ask for this or in case you reach the decision that some of the mailing list members should not be part of the mailing list anymore. Each member will be able to see only their own address in the "To" field of the emails they get, but not the addresses of the remaining members of the mailing list.