i want to send email using SharePoint hosted app to receiver(not only share point user),i followed This but it is allowed me to send mail to only SharePoint users,and when am trying to send mail to some one who is not a SharePoint user then am getting the error at _api/SP.Utilities.Utility.SendEmail by saying bad request
(Failed to load resource: the server responded with a status of 400 (Bad Request))
is there any way to send email through SP-Hosted App without using SP.Utilities.EmailProperties?