What does this error message mean

[wade at wadesmart.com]

11112006 1956 GMT-6

Im slowly starting to get my email situation figured out but I have
several hundred of these email messages in my inbox:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

wade at localhost
   SMTP error: 550 <wade at localhost>: Recipient address rejected: User
unknown in local recipient table

And then this was in the body:
Received: (qmail 24654 invoked from network); 12 Nov 2006 01:52:45 -0000
Received: from unknown (HELO pre-smtp10-02.prod.mesa1.secureserver.net)
([64.202.166.62])
          (envelope-sender <wadesmart at yahoo.com>)
          by smtp11-02.prod.mesa1.secureserver.net (qmail-ldap-1.03)
with SMTP
          for <wade at wadesmart.com>; 12 Nov 2006 01:52:45 -0000
Received: (qmail 3400 invoked from network); 12 Nov 2006 01:52:45 -0000
Received: from web54201.mail.yahoo.com ([206.190.39.243])
          (envelope-sender <wadesmart at yahoo.com>)
          by pre-smtp10-02.prod.mesa1.secureserver.net (qmail-ldap-1.03)
with SMTP
          for <wade at wadesmart.com>; 12 Nov 2006 01:52:45 -0000
Received: (qmail 64968 invoked by uid 60001); 12 Nov 2006 01:52:44 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws;
  s=s1024; d=yahoo.com;
 
h=Message-ID:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding;
 
b=2fl0u2Esbx35XP4faIpNJx/QPg4f3mmhySt2i4Q5OTm0vj2hGkgtgTqPj3dex3F+1h41Cm8X8YcGZp1R8riU02xY+AGDnKKcfJ5ikpoL26rRLFV89GQ3m07EWf36ZK2REcNQbJnMs/4q5e+xFYd95OA4MwXD5dOXiThaDlW1UeI=
 ;
Message-ID: <20061112015244.64966.qmail at web54201.mail.yahoo.com>
Received: from [69.92.172.113] by web54201.mail.yahoo.com via HTTP; Sat,
11 Nov 2006 17:52:44 PST
Date: Sat, 11 Nov 2006 17:52:44 -0800 (PST)
From: Wade Smart <wadesmart at yahoo.com>
Subject: Re: test at 11112006 1949 GMT-6
To: wade at wadesmart.com
MIME-Version: 1.0
Content-Type: text/plain; charset=ascii
Content-Transfer-Encoding: quoted-printable
X-Nonspam: None


Wade