ERROR_CODE :554, ERROR_CODE :5.7.1

ERROR_CODE :554, ERROR_CODE :5.7.1

Today I'm receiving an error when I send to one particular client. The error message began after adding the clients domain to the anti-spam whitelist in Zoho since all their emails were dropping into my spam folder. Now I cannot email them at all!

Please HELP!


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A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. 

******  Error, ERROR_CODE :554, ERROR_CODE :5.7.1 Filter Rule 19 - Filter Macro 17972 


Received:from ***** by mx.zohomail.com 
    with SMTPS id 1424878284768711.0539222195359; Wed, 25 Feb 2015 07:31:24 -0800 (PST) 
Message-ID:<015201d05110$1c1d4030$5457c090$@*****.com> 
Date:Wed, 25 Feb 2015 08:31:20 -0700