Dayton is a city of 2,400 people (2019) in the Palouse region of eastern Washington. It is the county seat of Columbia County. It has an historic depot, historic courthouse, and Main Street, that are part of a National Historic District.
I was making improvements to the local inter-user mail program called SNDMSG. Single-computer electronic mail had existed since at least the early 1960’s and SNDMSG was an example of that. SNDMSG allowed a user to compose, address, and send a message to other users’ mailboxes.