mail delivery 550 error

This report relates to a message you sent with the following header fields:

Message-id:
<!&!AAAAAAAAAAAYAAAAAAAAAEJABgvrLzBDv7JG3H9OLwvCgA AAEAAAAJR8bUM8DjNGtGI8MbOUp1YBAAAAAA==@hostdomain. com>
Date: Thu, 27 Apr 2006 22:47:52 -0400
From: Sales <sales@hostdomain.com>
To: user@clientdomain.com
Subject: test

Your message cannot be delivered to the following recipients:

Recipient address: user@clientdomain.com
Reason: Remote SMTP server has rejected address
Diagnostic code: smtp;550-"The recipient cannot be verified. Please check all recipients of this message to verify they are valid."
Remote system: dns;clientdomain.com (TCP|167.206.4.204|64171|xxx.212.70.202|25) (server3.hostdomain.com ESMTP Exim 4.52 #1 Thu, 27 Apr 2006 21:47:57 -0500 )


I ran /scripts/eximup --force and ./fixmailman

I also have all the options checked in exim config (whm). Not sure why this is happening. DNS is fine and propagated.

 

 

 

 

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