To find relevant news group can be a challenge in itself. There are over 40,000 news groups but you can use Deja News to search for news group names and archived articles. Before asking your question, follow the postings for a week or two. Look out for the FAQ, there is a good chance it will answer your question, or point you to a web site or archive that will do so. A mailing list is simply a list of email addresses of people who all interested in a particular subject.
Any mail sent to the list is copied to everyone on the list.
We have a list of Lists of Lists which may help. Web sites which are dedicated to a subject may make mention of a mailing list. Mailing lists, especially those of a technical nature, are often archived, and a Web search will often find references to these archives. People Finding someones email address can be difficult. If you are in contact with them anyway then you ask.