"Danny D." wrote;
On Thu, 07 Mar 2013 21:30:35 +0000 Whiskers wrote:

there are other free-of-charge NSPs with whom you could register.

That's exactly how I got around the banlist in order to
test what was going on.

Albasani requires a registration, but its post worked.
Aioe doesn't require a registration, and its post failed.

Now I know why. Thanks to everyone who answered.

You will find AIOE.org has extensive "ban lists" across
many a newsgroup and indeed further filtering within
whole groups. Like, try using "Derbyshire" and/or
"Paul Derbyshire" in a Body or Subject of a post directed at
a.f.newsservers.
As per the above known troll s.e.repair was subjected to
major troll/flame crusades back around 2003/4 and is - as
best as I recall - the very first newsgroup Paolo initiated
his Cleanfeed changes on.
You will find all servers have variations on filtering.
Albasani for instance requires a "followup-to" to be set
on cross posts.
Others limit cross posting and some do not allow
X-Header injections.
All of it is a discovery tour, enjoy... without being an ass.