"comp.os.plan9 is a moderated newsgroup for discussion of the Plan 9 operating system and related systems. It's a forum to ask questions and share information about installing, administering, using, and developing the system. Discussion of the original Plan 9 from Bell Labs as well as all forks, derivitives, or otherwise related systems are on topic. "
They are explicitly not running it via 9fans bridge. Access is via NNTP only.
Thunderbird sports a very mature NNTP interface if you have a newer computer. Claws-Mail also has a very good and fast NNTP interface, even on older computers. SLRN is available for a terminal-based interface.