I am trying to create a Windows Mail plugin (addin) for Windows (Universal Windows Platform) UWP. I know that I must declare the Capabilities, and that email is a 'restricted capability', but still it can be used, the only drawback is that it could not be uploaded to Windows store. My question is how to intercept the send event, Eg: on send I want the user to confirm some stuffs and only then, send the mail. Can anyone please help me on this ?

I didn't find the right solution from the Internet.

-References
-https://social.msdn.microsoft.com/Forums/windowsapps/en-US/40fde2cf-9bb4-4ea0-9137-8bcf5703bb93/addin-for-windows-mail?forum=wpdevelop

-Software Tool Video