Conversation so far:
What was the Judith Miller anthrax hoax about?
On October 12, 2001, Miller opened an anthrax hoax letter mailed to her New York Times office. The act was a copycat hoax of the 2001 anthrax attacks.
Who was the anthrax hoax letter to Judith Miller mailed from?
The most likely suspect was Bruce Ivins.

Question: Why was the letter mailed to Miller ?
Self-contained rewrite: Why was the anthrax hoax letter mailed to Judith Miller ?