I emailed the newsreader and recieved this reply:
We have been actively working to deal with this recent, aggressive spam
attack and believe that we have finally gotten things under control. Please
check the announcement on our website, http://www.usenetmonster.com , which
"NOTE - May 22, 2009 - Please note that we are aware of the spammer using
multiple accounts across our servers and spamming many text groups! We
believe we have the problem resolved. If you are a new user and wish to be
able to post more than 100 messages a day, please contact
firstname.lastname@example.org to be whitelisted."
We are continuing to monitor the situation and appreciate reports of any
future spam/abuse should they occur.
Usenet Monster Support
==================Ticket ID: FNB-488321