it's fairly common to ask for the year to be included in submission titles that are old. It helps clarify for the reader that we're going to see something out of computer history (or general world history) rather than something brand new.
Well, my first thought was: "what hubris is this?", before taking note of the archaic name and the domain name and figuring it was probably an interesting old Usenet post. Adding [1991] would perhaps prevent someone from missing it through a similar line of thought?
I grew up with computers in the 80s that didn't have Internet connectivity. I didn't get Internet access at home until 2005. Mailing lists confuse the hell out of me.
That's interesting, considering that mailing lists (like news/Usenet) were ideal for offline use, having been designed back in the day when Internet often had to be dialed up at specific times to exchange mail and news asynchronously (remember UUCP?). You can read and write submissions offline and submit them later.