Entando Plugin: Email Sender
· Provides the basis for Registration Forms and Newsletter services, and all plugins that require sending email: es: User Registration forms, Web Forms, Newsletters, etc.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window entando-plugin-jpmail-5.3.2.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.