Undelivered Mail Returned to Sender

This is the Postfix program at host caucho.com.

I'm sorry to have to inform you that your message could not be
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 Postfix program

<johnm-hessian@xxx.net> (expanded from <hessian-interest-mailout>): delivery
    temporarily suspended: Host or domain name not found. Name service error
    for name=non.net type=MX: Host not found, try again

attached mail follows:

Hi, I've never sent a message to you before, so my spam filter trapped
your email. If you're really a human being and not an evil spammer,
please click the link below or paste it into a web browser; doing so will
add you to my list of non-spammers (so you won't get this email in the future)
and it will move your message from my spam folder to my incoming mail folder.

Thanks!

  - Adam

http://www.megacz.com/spam.jsp?spamid=x4497BD95.2080907%40ntk.novotelecom.ru

About this message:

NOTE: SPAMCOP DOES NOT CONSIDER THIS TO BE SPAM; see this:

         http://www.spamcop.net/fom-serve/cache/369.html

      and examine the "x-originally-received" header on this message
      for the required "chain of custody" information.

      Only one of these challenge messages is ever generated in response to
      a given inbound SMTP connection; it cannot be used to amplify spam
      attacks, and in fact actually retards them while also stripping the
      advertisement they were meant to convey.

      Only one delivery attempt for this challenge is ever made, and it is made
      DURING the SMTP delivery of the message being challenged (that is,
      between C:DATA and S:250); the deliverer of the possibly-spam message
      must remain SMTP connected to my server during the entire process or else
      the delivery will immediately abort. These challenge messages are NEVER,
      EVER queued for multiple delivery attempts
      
      For more information, please see:
      
      http://www.templetons.com/brad/spam/crgood.html