Undelivered Mail Returned to Sender

Undelivered Mail Returned to Sender

Hi i received this response after send email to a hosted rackspace email account.

I hope you can help me.

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Undelivered Mail Returned to Sender[to @xxxxxx.com


Received:from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1481304576264757.9266042161432; Fri, 9 Dec 2016 09:29:36 -0800 (PST) 
Message-ID:<158e4a210fa.bca c4b8925302.2461679586218422337@xxxxx.com
Date:Fri, 09 Dec 2016 12:29:36 -0500 
From:Richard Endara <from @xxxxxxxx.com
User-Agent:Zoho Mail 
To:"estefania" <to @xxxxxx.com
Subject:test 
Content-Type:multipart/alternative; 
    boundary="----=_Part_78206_1853010905.1481304576253"from mail.zoho.com by mx.zohomail.com 
    with SMTP id 1481304576264757.9266042161432; Fri, 9 Dec 2016 09:29:36 -0800 (PST)