NDR problem

What is the remedy for this ?
 
Best Regards
 
Shoeb 
Senior Network Engg.
Edi Technology, LLC
office (971) 4-2865010
shoeb@xxxxxxxxxxxxxxxxxx
  _____  

From: Andy David [mailto:adavid@xxxxxxxxxxxxxxxx] 
Sent: Saturday, October 23, 2004 5:03 PM
To: [ExchangeList]
Subject: [exchangelist] Re: picture in owa
 
http://www.MSExchange.org/
It tells you why in the NDR.
 
"[217.165.51.61] blocked using dul.dnsbl.sorbs.net, reason: Dynamic IP 
> Address See: http://www.dnsbl.sorbs.net/lookup.shtml?217.165.51.61>"
 
 
 
  _____  

From: shoeb [mailto:shoeb@xxxxxxxxxxxxxxxxxx] 
Sent: Saturday, October 23, 2004 8:15 AM
To: [ExchangeList]
Subject: [exchangelist] Re: picture in owa
http://www.MSExchange.org/
I am trying to send a email to one of my client , getting following
error
 
The following recipient(s) could not be reached:
> 
>       'M.Prakash@xxxxxxxx' on 10/23/2004 1:52 PM
>             There was a SMTP communication problem with the
recipient's email server.  Please contact your system administrator.
>             <egs-exh.server.local #5.5.0 smtp;554 Service unavailable;

> [217.165.51.61] blocked using dul.dnsbl.sorbs.net, reason: Dynamic IP 
> Address See: http://www.dnsbl.sorbs.net/lookup.shtml?217.165.51.61>
 
 
But if I try to send the mail from other domain the mail reaches to the
above email address.
 
Can anyone highlight on this and what is the remedy for this
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