*I don't see how this scheme would work with contextual based advertisements? Or maybe you are talking about a premium subscription service that does not rely on advertisements for revenue. (?)*
>From OP, "The only downside of this approach is that email providers are not able to filter spam or provide related Ads based on email content. Even this might be solved in the future because of private outsourced computation" Private outsourced computation will let you search Google without revealing to Google what you searched for(thus getting the Ads). However, this cryptography function is still in experiment, for now, Google might provide Geo-location ads or just show ads from users' search history,etc
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