Hi Sir, Your project is really interesting and I have a code which can give you 100% success rate for your required email providers. But to achieve a processing of 1Cr of emails per hour with the system configuration you selected is a little bit difficult task. I can give you my code as a RESTfull API service, which you can utilize just by sending an email address to be verified and get the response. In this way, you don't have to manage any infra at your end, all I have to see it. I can do it with system configuration higher than you selected.
Regarding your GUI requirements, I can't work on that, all I can do is provide you an API service.
Can you will talk for more clear discussion?