Fwd: Undelivered Mail Returned to Sender

Who do I contact then to find out this information if the list owner is 
bouncing back to me?

Lig

-------- Original Message --------
Subject: Undelivered Mail Returned to Sender
Date: Fri, 14 Sep 2012 10:07:38 -0400 (EDT)
From: MAILER-DAEMON (Mail Delivery System)
To: [email protected]

This is the mail system at host smtp33.relay.iad1a.emailsrvr.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                    The mail system

<[email protected]>: host smtp.jaxlug.org[66.129.85.220] said: 550 5.1.1
     User unknown (in reply to RCPT TO command)


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