The term “going postal” originated in Edmond, Oklahoma on August 20, 1986 when a disgruntled postman named Patrick killed 14 fellow employees and wounded six more. Other significant post office shooting incidents have occurred in Michigan and California, and a total of 35 people have been killed in 11 incidents since 1983.
The first mention of the term, “going postal,” occurred in the St. Petersburg Times.
From what I hear, Edmond is a quaint town with a few good bars and decent Mexican food. Just be sure to stick to email for correspondence purposes.