In this documentation you will learn
Admin panel > Left menu > SETTINGS > Newsletter
Newsletter is a regularly distributed publication, content, product, compaign, etc. to its subscribers.
In this admin section, newsletter is using smtp in order to send an email.
Admin user is able
view all subscribers
Admin panel > Left menu > PLUGINS > Newsletter
Newsletter is a plugin module, enable admin user to show the plugin that is newletter form for front user or visitors to subscribe.