If you make use of a mailing list to get in touch with some or all of the visitors/users on your web site on a regular basis, its subscribers are often called mailing list members. They have to sign up and to express their explicit permission to receive automatic email messages. You can authorize mailing list members manually too, on the condition that the software program that you use to manage the list permits this. In accordance with the generally accepted policies, a list member should be able to unsubscribe whenever they wish. You, as the mailing list admin, can also remove mailing list members if they should not receive email messages for whatever reason. The messages that each member gets will have just one address in the "To" section, not the addresses of all the mailing list members.