Last night's letter looks written with a poison pen, which got me thinking about poison pen letters. A little research netted more results than imagined. Agatha Christie wrote at least one story about the power of the poison pen, as did an ocean liner load of writers over the years. Who doesn't like a who-done-it with a pen and paper? Would such letters work with today's technology? Burner phones seem to get the job done without leaving easily solved clues beyond tracking cell tower ping maps. Envelopes would have too many traceable clues, including telltale DNA. Besides, tabloids do the work for the sender, and pays them for the privilege of poisoning the intended target. Are poison pen letters the things of old fashioned mystery plots for the likes of Agatha Christie and Perry Mason? Hmm.
In the United Kingdom, Section 1 of the Malicious Communications Act 1988 covers most cases of poison pen letters. (Wikipedia)
Poison Pen Letter: