updated mailing list URL

index.html

@@ -111,7 +111,7 @@ <h2>Express & Exchange</h2>
         <h2 class="mb-4">Subscribe to Community Emails</h2>
       </div>
       <div class="col-md-10 col-lg-8 col-xl-7 mx-auto">
-        <a href="mailto:case-community+subscribe@googlegroups.com">
+        <a href="mailto:community+subscribe@cyberdomainontology.org">
           <button type="submit" class="btn btn-block btn-lg btn-primary">
             Subscribe to Community Emails
           </button>