Conversation so far:
What was the anthrax hoax about?
On October 12, 2001, Miller opened an anthrax hoax letter mailed to her New York Times office.
Who was the letter mailed from?
the government's investigation of these mailings focused on Bruce Ivins, who later committed suicide, with the investigation determining that Ivins acted alone.
Why was the letter mailed to Miller ?
anthrax-laced letters sent to ABC News, CBS News, NBC News, and the New York Post, all in New York City, as well as the National Enquirer in Boca Raton, Florida.

Question: What was the content of those letters?
Self-contained rewrite: What was the content of the anthrax letters mailed to Judith Miller?