 Mailers using appending by definition do not have consent of the individuals on their lists, since the individuals did not disclose their email addresses to begin with.Mail sent by appending methods therefore is Opt-out instead of Opt-in e-mail.In September 2011, The Messaging Anti-Abuse Working Group (MAAWG) released a position paper stating the practice of email appending is in direct violation to their values and is an abusive practice.