550 Requested action not taken - Recipient not allowed>

hello ,
i am trying to send email to a domain from our domain and i get
550 Requested action not taken - Recipient not allowed>
Your message did not reach some or all of the intended recipients.

      Subject:      Test from LockeLiddell
      Sent:      3/19/2007 10:38 AM

The following recipient(s) could not be reached:

      abc@domain.com on 3/19/2007 10:39 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
          #5.5.0 smtp;550 Requested action not taken - Recipient not allowed>

  cvb@domain.com on 3/19/2007 10:39 AM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
    #5.5.0 smtp;550 Requested action not taken - Recipient not allowed>

I cannot ping their MX records (IPs)
but if i send from my hotmail account the email goes through
We have exchange 2003 server
Any ideas ?
c_hocklandAsked:
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c_hocklandAuthor Commented:
i checked my dns settings and everything seems correct there.
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c_hocklandAuthor Commented:
ok, i think it works now. I built a smtp connector towards this domain and it seems it did the trick.
thanks
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