Notice the original message has snipped-for-privacy@telecom-digest.org
> in the To header, so perhaps someone at your end could check to see
> who would have gotten the original message.
As Pat noted, that was a Usenet message ID scraped off the net many years ago.
Those addresses get a fair amount of spam, and since they're easy to recognize they go into my spamtrap where they're logged and if it's from a source the spamtrap can figure out, it sends off a complaint.
R's,
John