If you have domain admin permissions for your SmarterMail login, you can go to Domain Settings -> Accounts. Here are tab for all users set up for the domain: users, aliases, and mailing lists. If the mailing list in question is hosted on SmarterMail, it should be listed on the Mailing Lists tab, and show the moderator, subscriber count, etc.
Derek Curtis
COO
SmarterTools Inc.
www.smartertools.com