My earliest usenet presence
That I can find is this from 1990, but I'm sure I was posting earlier. Complete with double .signature - sigh!
OK, here's a slightly earlier one - again asking about usenet software!
Ah, I needed to search for uk.ac.man.cs rather than the other way around and pushes it back to May 89 though I'm sure I posted to uk.* before that but google groups seems light on those - no posts from uk.followup at all!