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I had a similar idea to this and wanted to add a couple of more features. It essentially is policy-based email so I thought:

  * Every cert is put into a trust classification that can dictate a default policy
  * Policy items could include things such as rate limits, message sizes, spam filter weights, etc.
  * Identities can be tied to multiple certs to allow for different modes of communication when desired
  * Allow for a trust classification labeled as "public" that is the default classification (with strict limits by default)
  * Make common mail items first class objects and allow URLs (e.g. attachments are no longer inline but must be a URL with metadata that can be verified before my system is willing to pull it on my schedule).

I have other ideas as well; This is something I've been thinking about a lot lately. One other feature that would be nice is if you could somehow link it up to SMTP gateways. I realize that sort of defeats the purpose, but that would accelerate adoption of any new technology since it has so much gravity.

Anyway, just ideas for now...

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1. anyone who wants a clean inbox -- maybe less profitable 2. any company that wants better protection against phishing attacks -- maybe more profitable 3. Edit to add: someone pointed to https://www.mailinblack.com/ I don't speak French, but that's apparently a company that (somehow) provides a service similar to the description here to high-profile targets.

1. it would have to rely on email addresses alone -- I don't know another way to transmit information from sender to receiver that fits within current "what's your email?" standards. 2. it would have to have a sparse enough address space that accidental collisions are unlikely -- so maybe 8 alphanumerics for ~41 bits?