The plugin allows external sites to interact with ThreeWP Email Reflector.
Programmers can use the SD_Email_Reflector_Remote_Access_Call.php
class to send calls to Email Reflector. Documentation and examples for using the the Remote Access Call class is embedded in the class source file.
Unless you’re a programmer, or have set up other sites with the API, then this plugin will do nothing useful.
Together with the mailing lists and the settings for the Email Reflector.