If you make use of a mailing list to get in touch with some or all of the visitors/users on your website on a regular basis, its subscribers are often called mailing list members. They need to register and to express their consent to receive automatic emails. You can include mailing list members manually too, in case the program that you make use of to manage the mailing list permits this. According to the generally accepted policies, a list member should be able to unsubscribe at any time. You, as the mailing list administrator, can also delete mailing list members in case they should not receive emails for whatever reason. The messages that each member receives will have only one single email address in the "To" field, not the addresses of all the members.