“Pandoc-discuss” is #pandoc's official mailing list: https://groups.google.com/g/pandoc-discuss. It is the central point of contact for pandoc users and devs; use it for any questions about pandoc.
The web interface is misleading in that it makes it seem like a Google account is required to post. However, it's enough to write a mail to pandoc-discuss+subscribe@googlegroups.com to subscribe to the list with any mail address. #support #mailingList