troubleshooting Question

There was a SMTP communication problem with the recipient's email server #5.5.0 smtp;550 Client host rejected

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mdrwiega asked on
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I am running SBS Server 2003
Outlook 2003

While replaying to a message that I received I get this error message.
I can send/receive messages from other people and different domains, but some of them I am unable send to or receive.  I am pulling my hair over this one.  The server has been running fine for past 12 months, this problem happened recently in last 4 weeks.

The following recipient(s) could not be reached: on 2/11/2006 1:28 AM
  There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <server.ETCTransport.local #5.5.0 smtp;550 <[]>: Client host rejected: CABLE HS R#2>
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