Not authorized to send mail

When sending sending email I get the following message.  How do I resolve this?

Your message did not reach some or all of the intended recipients.

      Subject:      test
      Sent:      3/16/2005 1:04 PM

The following recipient(s) could not be reached: on 3/16/2005 1:02 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            < #5.5.0 smtp;553 You are not authorized to send mail as <>>
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This question is in the wrong forum.  I am assuming you are not running an SMTP server...

   The problem is problem in your mail client setup.  More than likely you need to turn on SMTP authentication.
davewinstonAuthor Commented:
I am running a SMTP Virtual Server.  Tried turning on SMTP authentication it didn't work.
You are running a virtual server as  You need to use there SMTP server if you are going to send it from thier domain smtp server.  There are swf / txt records that do not authorize any server to be any domain to prevent email spoofing.  You can only send emails from your domain or one w/out a TXT record in the DNS. Do you own the domain?

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Windows Server 2003

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