I very recently have been accepted as the moderator of an abandoned, moderated group.
As such, I needed to find a Usenet provider who would accept posting into moderated groups, from a moderator.
I originally contacted Eternal September, and Wolfgang informed me my account had been configured to allow such posting, but it does not work ("account not authorized") and now he does not respond to email.
I then contacted four commercial providers, all of whom did not know about moderated groups, and either failed to respond in a timely manner (a week) or failed to grasp the concept of moderated groups;
1. Giganews
2. Tweaknews
3. Eweka
4. Usenetserver
Giganews first line support did not know about moderated news-groups. I explained, and once the support staffer understood, a support ticket was created. Giganews claim a few hours response time. When asked about this, they then say up to three days. After seven days, I cancelled the support ticket.
Tweakness, Eweka and Usenetserver I think are in fact the same company. I could be completely wrong, but they all use the same support software, have the same options in the drop down lists on their sites, and so on.
All did not know about moderated news-groups, and all were unable to grasp the concept, and all then went into that failure mode, where support is giving the wrong answers to questions, not paying attention to what is written, not reading the history of communication, and so finally going into a loop which consisted of them telling me "you need an account to post" (where they meant posting normally - not as a moderator), which they had said before, and which I had replied to before (explaining again about moderated news-groups, to which they explained Usenet is not moderated and anyone can post, etc, etc, etc).
After two weeks, I gave up with them.