On Thu, Oct 10, 2013 at 03:54:26PM -0400, John Kelsey wrote:

> Having a public bulletin board of posted emails, plus a protocol for
> anonymously finding the ones your key can decrypt, seems like a pretty decent
> architecture for prism-proof email.  The tricky bit of crypto is in making
> access to the bulletin board both efficient and private.  

This is what Bitmessage attempts to achieve, but it has issues.
Assuming these can be solved (a rather large if), and glue 
like https://bitmessage.ch/ is available to be run by end users
it could be quite useful.
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