emacs gnus setup for e.g. eternal-september.org:
(setq gnus-select-method '(nntp "news.eternal-september.org")
nntp-open-connection-function 'nntp-open-tls-stream
nntp-port-number 563
gnus-posting-styles '((".*"
(name "anon")
(address "anon@host.tld")
(reply-to "anon@host.tld"))))