Mailman

I have two issues that I am trying to figure out.
My installation is the current ISPConfig3 release, along with Nginx and Ubuntu 15.x. I followed the perfect server configuration to a "T" here on HowtoForge. When trying to send an email to a list I just created, I get an error message back. I tried to send an email to -owner and below is the email I receive back:

Code:

Your message cannot be delivered to the following recipients:

Recipient address: [email protected]
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550 5.1.1 <[email protected]>: Recipient address rejected: User unknown in virtual mailbox table
Remote system: dns;lists.edutrac.com (TCP|17.172.80.96|43468|104.131.0.33|25) (reformed.edutrac.com ESMTP Postfix [Ubuntu]) 

My second issue is that I am wanting to setup lists at lists.edutrac.com instead of edutrac.com. So, what I did was create an email domain for lists.edutrac.com so that I can add mailing lists under the lists.edutrac.com vhost. However, when I visit lists.edutrac.com/cgi-bin/mailman/listinfo, there are no lists present, but if I visit edutrac.com/cgi-bin/mailman/listinfo instead, then I can see all the lists I created. How, can I fix this so that all lists can be seen under lists.edutrac.com?

Here is my current Nginx snippet:

Code:

        location /cgi-bin/mailman {
               root /usr/lib/;
               fastcgi_split_path_info (^/cgi-bin/mailman/[^/]*)(.*)$;
               include /etc/nginx/fastcgi_params;
               fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
               fastcgi_param PATH_INFO $fastcgi_path_info;
               fastcgi_param PATH_TRANSLATED $document_root$fastcgi_path_info;
               fastcgi_intercept_errors on;
               fastcgi_pass unix:/var/run/fcgiwrap.socket;
        }

        location /images/mailman {
               alias /usr/share/images/mailman;
        }

        location /pipermail {
               alias /var/lib/mailman/archives/public;
               autoindex on;
        }