Startup idea validity

So I have an idea for startup I've been planning, researching etc. the idea ultimately is to make any email address 'whitelisted' with 'white hat' methods to ensure emails are delivered to the inbox and not Junk/Spam. Obviously there are factors such as message content that make a difference too, but excluding those and talking just about the email address health/reputation, do you this is a service some might be interested in, and willing to pay for it? Thanks, and looking for to your comments - please don't hold back.