The Jennings Letter
The Jennings Letter was a proposed, but never issued, magazine by Richard Kaufman in 1993.
It was to be limited to 500 subscribers and be published on special paper to discourage photocopying. Issue No. 1 was slated for March 1993.
However, as Kaufman explains within his Inner Workings column in the following issue of Magic (April 1993), he decided not to begin publishing The Jennings Letter (and would be refunded all money). He did not get close to the limited number of 500 subscribers in order to make the venture financially viable. He cited the reasons as too many magazines already on the market and realization that anything published in these letters would most likely be republished in the books that he was writing with Jennings.
He included Jennings' "Walking Man" routine in that month's Magic column as something that he would have put into the newsletter.