It is similar with the subscription prozess, is n't to be called: double opt-in/out or confirmed opt in out.\34; The subscriber is very similar to the one you have to used to subscribe to the list at begining of 1st.
This is similar to the subscription process, and is referred to as "double opt-in/out" or "confirmed opt-in/out"). The process is very similar to the one you had to use to subscribe to the list in first place.