On 11/17/2014 09:30 PM, Nan wrote: > I think you'll find this has been solved for years. The solution is PGP/etc. between mail servers, and TLS/SSL to the user.
Why use PGP between mail servers? SSL/TLS can be used for that, too. Actually, opportunistic server-to-server TLS is supported by many mail server software, and is becoming more and common. Using PGP for anything less than end-to-end encryption seems pointless to me. Particularly if it distracts mail server administrators from enabling server-to-server TLS, which we need anyway to protect the metadata (headers) that are *not* encrypted by PGP.
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