I just can’t figure out what this message is supposed to be. My first thought was that someone was replying to spam that used a forged sender, but it scored 11 points in SpamAssassin for forged headers (it claimed to be from Yahoo, but wasn’t), a date stamp from the future, and Bayesian analysis.
From: Stock Advisor <probably fake address>
To: Stock Advisor <target address>
Subject: Go where?
To top it off, it showed up in several spam traps with different subjects and senders, but the same two-word body. Maybe it’s a probe of some sort?