Just a warning: Eternal September's administrator doesn't give a damn about trolls and spammers posting through that server; every single complaint I filed went 100% ignored.

It's worse than that. They won't even take action against harassment of moderators, including their users that repeatedly submit obviously rejectable articles to moderated newsgroups, then reply with verbal abuse and profanity when rejected. The eternal-september admins tell moderation teams that it is their responsibility to deal with these users, not them. Our moderated newsgroup dealt with one of their users (lawfully, of course). No surprise that the individual had an anonymous identity that was a synonym for the devil.

The registration system seems to be borked. Any others?

It worked for me, but I had to disable adblockers.

The free "10 GB" trial accounts available from usenet binaries providers can serve as a text only read/posting account for years. Like with usenet.farm

The free account on usenet.farm does not allow posting.

Ah geez. You're right. Thanks. I set up one for a back-up for when eternal-september is down but never tried actually posting on it.