Post by email@example.com
I wouldn't particularly bother now, but back in the day...
Right. Usenet antedates the internet. When the internet became
public in the early 90s, Usenet was already a fully formed entity and
was by then running on the net instead of (or in addition to) batch
transfers over modems.
So when spam was invented (remember the greencard lawyers?) Usenet
was the obvious source for scraping email address lists.
When, before long, the WW Web upstaged news (it was more like TV and
less like, yew know, reading) and Usenet news lost popular attention
and faded away, no self-respecting spammer would bother with it any
more. There are places to buy or steal much better address lists now.
As a matter of odd fact, though, I've had more weird mail from my web
page than from net news. I have a (putative) humor page called
"Resident Alien". That is the legal term used by the US Gov't to
designate a greencard holder who has been given permanent US residency
status. So I got email from people wanting help getting a greencard,
enough so that I elided my email address from the web pages.
Mike Spencer Nova Scotia, Canada