[ExchangeList] Please help

http://www.msexchange.org
-------------------------------------------------------I am facing this problem 
while sending a mail to a
particular mail id. Kindly help


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

Subject: test mail again 
Sent: 5/29/2006 12:36 PM 

The following recipient(s) could not be reached: 

  abc@xxxxxxx on 5/29/2006 12:37 PM
  There was a SMTP communication problem with the
recipient's email server. Please contact your system
administrator.
  <server name #5.5.0 smtp;553 sorry, that domain
isn't in my list of allowed rcpthosts (#5.7.1)>


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