Headers are always spoofed on spam emails. The spammers don't want to be blocked so they make it harder to trace the real origin.
And it took a while, but ISPs figured out that them sending reply email ("bounces") were essentially doubling the number of email for no good reason (since the headers are usually spoofed).
If no one ever bought anything from those spam, eventually they would go away, but since it only takes 1 out of 1000 (or even fewer) to be profitable, there are more than enough morons to keep the spammers in business.
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"The problem with any ideology is that it gives the answer before you look at the evidence."
—Bill Clinton
"The greatest obstacle to discovery is not ignorance--it is the illusion of knowledge."
—Daniel J. Boorstin, historian, former Librarian of Congress
"But the Senator, while insisting he was not intoxicated, could not explain his nudity"
—WKRP in Cincinatti
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