Recently I changed the component: JNews. In addition, the server on which you loaded the site does not allow the use of crontab task. So use the service offered by JOOBI.
To configure the service and use of this component, I used the JOOBI’s online support.
Online support was very helpful because in a few minutes with a step-by-step procedure, I managed to set up the service and send a newsletter.
I have to thank the support service because the person who assisted me in this operation has been very patient.