Confusion about a statement in the FAQ

[Robert J. Hansen]

> I'm confused by this. What does it mean? What does 'armor the mail
> headers" mean? Is this the same as 'encrypting' the mail headers or does
> it mean something else?

It means there's a way to cryptographically protect most (but not all)
email headers, which foils many kinds of metadata analysis.

At present I don't think any email client supports this capability.
However, it's planned for Enigmail and other clients, and it's a good
reason to use PGP/MIME instead of inline.