I read the racket mailing lists via nntp via gmane.io
Could the discourse lists be setup to at least allow reading via nntp (I think writing ends up being like writing to the maiuling list - ie the poster has to register their mailling address - but I accept that I might have missed something and accept this would be read only)
It doesn’t look like it is supported. I’ve done a search and this issue has come up a handful of times; plone in 2017; Julia in 2016. In all cases it seemed to dead end.
If you can identify a solution I’d be happy to try get it in place.
I did find out that Discourse supports RSS and JSON feeds;
Some nntp clients also support RSS (e.g. Mozilla Thunderbird) so maybe that is an option for the client you use?