Anyone looked at BitMail p2p ?
   [1]http://sourceforge.net/projects/bitmail/?source=directory
   2013/12/24 grarpamp <[2]grarpamp@gmail.com>

     This thread pertains specifically to the use of P2P/DHT models
     to replace traditional email as we know it today.
     Pasting in a very rough and unflowing thread summary to date
     for interested people to pick up and discuss, draft, etc.

References

   1. http://sourceforge.net/projects/bitmail/?source=directory
   2. mailto:grarpamp@gmail.com