There is a BLOCK SENDER choice that never works. When I mentioned that to someone in a newsgroup they suggested I set in rules instead.
The rules selection has two windows - the first is where you select something, like people in the FROM line, (This brings up the message author's email address), and the second window asks what you want to do with it. I always select DELETE IT.
It appears each time I get messages from that user they should be deleted, but that doesn't happen.
Microsoft's OE help doesn't address this for some reason.
On an older version of OE, when I took a block sender action, it blocked them. And it also asked me if I wanted to delete all that person's messages. Neither of these happen any more.
I want to be able to do this because the particular newsgroup (alt.astronomy) is full of trolls spouting garbish.