[toyg]

Not really. NSA already use their mail mass-dumps mostly for aggregated analysis, to pinpoint networks of interlinked individuals which they can then pass to other agencies for parallel construction.

Mailpile will not change that.

At the very least, we need metadata encryption right about now.

[sipior]

I don't disagree with your last statement, but I also wish to point out that there are, believe it or not, other reasons to encrypt email that do not involve the NSA.