The last online source is a bit of work, but involves searching for associations which have published, by searching the large national libraries. Incidentally, this process is similar to searching for theses - search normally but add the word theses to the query. Another prominent source are the local service directories, such as InfoLink in Western Australia. Most communities have a public directory of local associations and government authorities. If in doubt, ask a local librarian for directions to such a directory.
T here are three important research applications for mailing lists.
However, mailing lists are difficult to develop and maintain. Often, one of these go wrong and the forum dies. As a member, there are important obligations starting with participation, and ending with forum etiquette. The better forums are private. Membership is not automatic, the list manager has more control, and often, more control and effort is expended developing interesting content and discussion.