If you are using Outlook Express, as with other troublemakeers here,
either use the Message Rules (which is similar to Netscape or Mozilla)
Follow this guideline, for "news" https://support.nuvox.net/index.php/999
to copy/paste the posting name and email address into the rules

or plonk,  Highlight/select the post.
Click on 'message' between 'tools and help' at the top of OE...
then click on block sender..
They may not disappear immediately, only when you exit the newsgroup
and come back in.

If you are using newsreader Forte Agent, here's how to plonk him on every
newsgroup (under that email address).
Global filters in Forte Agent:
(I assume, like other newsreaders one selects that poster's post), then:
It's just 'Ctrl & K'  followed by 'I'

If you don't have a newsreader get one or please do not reply to these
posters.