Messages not being delivered

I have just setup a new Mailman server on Ubuntu.
With the help of list members, I have got the web GUI working.
Now, I have discovered that when I send new messages to the one list I have, e-mails are not being delivered.
I did receive the initial e-mail that the list was setup. However, none of the list members are receiving any new e-mails posted to the list.
I have checked the Archives, and no messages are being received (No messages have been posted to this list yet, so the archives are currently empty).
Here is what I see in the mail.log:
Recipient address rejected: User unknown in local recipient table
Any thoughts on how to fix this issue?
Thank you.
Peter W. Caton

On 02/05/2016 11:02 AM, Peter W. Caton wrote:
Here is what I see in the mail.log:
Recipient address rejected: User unknown in local recipient table
You don't have aliases and/or virtual mappings set up in your MTA. See item 3) in the FAQ at <http://wiki.list.org/x/4030723>.
Note: if your MTA is Postfix, alias generation and virtual mapping generation if required can be automated. See <http://www.list.org/mailman-install/postfix-integration.html>.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan

On 02/05/2016 11:02 AM, Peter W. Caton wrote:
Here is what I see in the mail.log:
Recipient address rejected: User unknown in local recipient table
You don't have aliases and/or virtual mappings set up in your MTA. See item 3) in the FAQ at <http://wiki.list.org/x/4030723>.
Note: if your MTA is Postfix, alias generation and virtual mapping generation if required can be automated. See <http://www.list.org/mailman-install/postfix-integration.html>.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan
participants (2)
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Mark Sapiro
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Peter W. Caton