[giantrobot]

While not a silver bullet, anonymous remailers can strip out a lot of metadata. Mixmaster remailers can also help against traffic analysis.

While not as popular as they once were networks of remailers are fairly easy to spin up.

[msbarnett]

None of this has anything to do with the incorrectness of the assertion that PGP would “beg to differ” that end-to-end encryption of email is impossible. Playing 3-card monty with your message is something else entirely.