Cannot create mailman list in EC2 instance, Pro or GPL

I am using these AMI's on Amazon EC2:

virtualmin-pro-3.56-paid/image.manifest.xml (ami-6d4ca904)
virtualmin-gpl-3.56/image.manifest.xml (ami-c442a7ad)

After I launch the instance and login to Virtualmin I attempt to create a virtual server and receive this error -- "Failed to create virtual server : Mailman cannot be enabled unless the administration list mailman has been created.This can be done in the Mailman plugin module."

I then attempt to create the mailman list and receive this error -- "[usage omitted] Illegal list name: mailman@ip-xx-xxx-xxx-xx" where x's show the actual EC2 private DNS name.

I have tried creating the mailman list both via Virtualmin and SSH. Using SSH I've tried specifying different url host name and email host names (mydomain.com) using -u -e options respectively. No matter what I specify in these options it seems to try to create the list with hostname ip-xx-xxx-xxx-xx, which it doesn't like.

What am I missing?

Status: 
Closed (fixed)