I was looking for the keyword “mailing list”. I found it only in
http://sphinx-doc.org/develop.html. I haven’t used Google Groups before, therefore I didn’t relate Google Group with mailing list and I didn’t try the link in “Questions? Suggestions?". If it has been only me who ended up in the wrong mailing list, I guess it is clear enough, and I just missed it.
I did not search for sphinx-* in the website, but I did it now and it does not return any result for sphinx-users. There are no results for mailing list either. If you search for “sphinx mailing list" in Google, there are not results for sphinx-users in the first page, but only for sphinx-dev.
Best regards,
Francisco