In the next probable situation, you will get the confirmed success message about sending data but you will not see that email in your mailbox. This means that your plugin sending option is working correctly. However, it is because your email is sent to the spam messages block. To resolve this issue, please address your personal email service (Gmail, Windows Outlook and etc.) spam folders. If you cannot find that message in your spam folder, please check the spam settings of your Email Server. If it does not help too, you can refer to the Support Team of your Web Hosting.