[albeertoni]

Not especially. As others have mentioned, email leaks metadata and the existing protocols are such that it would be impossible to secure them reasonably.

Of course, it all depends on what your threat model is. Are you a target of the NSA, or a jealous spouse? That's what this comes down to. Neither Lavabit nor Silent Circle could have given encrypted and unattributable email service - so if that's what you needed, you're SoL. If server-to-server encryption was all you were interested in, then the distros of pgpu they used would have been fine for you.

It's hard to think of a threat that would be stymied by server-to-server encryption alone. Maybe someone else has a good idea of what that might be, but it's too early for me.