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You didn't send ALL the headers, only some of them. You need to send on the full set to make a trace possible.
More specifically, the headers which are most needed are the Received: and Message-Id: headers; each mailer along the path adds another Received; header, typically with its name, a timestamp, and sometimes the name or address of the previous system. Other headers may also help.
Lee Tien writes:
So I got this message. How would someone identify the sender of this message? I'm writing an article on anonymity, with some discussion of remailers, and want to argue that forging already permits people to raise the costs of tracing significantly, anonymous remailers or no.
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