I am deploying on Shinyapps.io an app that sends an email. I want the user to be notified whether the email has been successfully delivered. However, I am unsure how to get feedback from mailR::send.mail about the delivery status.

I tried authentication with a correct vs an incorrect password. In both cases, a jobjRef class object is returned – the object contains a long list of functions/values that do not seem to differ much – at least I cannot find a value that indicates whether the delivery was successfully or not.

Any idea how? Thanks!