In the future, I would love to see an online website or websites which would allow a registered user to send a single solitary test email to their own email ad

In the future, I would love to see an online website or websites which would allow a registered user to send a single solitary test email to their own email address from multiple countries around the world. Basically, does an email message make it to my Inbox: If sent from the USA? If sent from Europe? If sent from Asia? If sent from Africa? If sent from South America? etc., etc., etc. Perhaps (if someone hasn't already invented the service, or something similar), I'll call the service "If Sent". What I love about the Internet today is that there are sites around the world to test global connectivity, global ping, global DNS domain name lookup/propagation, global website connectivity, etc., etc. Well, we need something similar for email... the ability to test sending a single piece of email to a single email address (which needs to be pre-vetted as belonging to the user) from multiple servers around the world. That is, the ability to test any given email provider -- for email connectivity...