The listserv accountname directs all request to the listserv list management software. The software can handle almost all subscriber requests, and you should always exhaust the resources of the listserv software before contacting the list owner. Throughout this message you will be told to mail listserv. You will be sent a confirmation message that you must reply to. Just hit reply when you receive it and type the words OK at the beginning of your reply.
Archives are available two separate ways.
First, you can browse the archives through the web. Simply click on mahler-list and you will be taken to the archives. You can read the archives themselves, which are compendiums of each month's posts, or you can enter a search string and you will be given specific posts that match your search. You can also have the full text of each archive emailed to you. This will result in your being sent a list of all the archive files.