Delivery to the following recipient failed permanently

Delivery to the following recipient failed permanently

I'm trying to send one email hosted by Zoho Mail Service and I'm receiving the response below:

Delivery to the following recipient failed permanently:

     flavio@promotools.com.br

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain promotools.com.br by mx-vip-02.uni5.net. [177.185.207.35].

The error that the other server returned was:
550 5.1.1 <flavio@promotools.com.br>: Recipient address rejected: User unknown in relay recipient table

----- Original message -----

DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:date:message-id:subject:from:to:content-type;














        bh=QjY24tFYwxki0yidDU+hxK/ 8go3ruFUwUO1Z/YZvtRg=;
        b=IBUUkxckIOcyY7P0gXzeJ6BtdaevIxLS3y7kjElkfXO7q4j2z0H+PtEW2OtyYFgdXR
         pYNlEsh6rYOTYTzJFAN6ru6h28rBu96KGfyrxHbGOe6GRuH9MkxT74rFo3GnBnwqvDet
         PrgsLpJJG/zBlWv0gboBtEZz9ibo2m6Ik3L7maycvJYHr7DjwYIUHjnQgqI/Ss6UWxZj
         05NOjoKgpnxdDiqgwpzR53uXGTUpDTLKc+gw5Uv9q49NHb/T9GU1psNbPRIuKIJVxx7A
         vDei73YIi7T0p+FCmWxGW9U0cUWXGVv1PFDCLwAVLdL/LySPz7WJEQXNMXzImB7N3ehx
         YUvg==
MIME-Version: 1.0
X-Received: by 10.58.172.67 with SMTP id ba3mr1763774vec.58.1369177674829;
 Tue, 21 May 2013 16:07:54 -0700 (PDT)
Received: by 10.220.168.133 with HTTP; Tue, 21 May 2013 16:07:54 -0700 (PDT)
Date: Tue, 21 May 2013 20:07:54 -0300
Message-ID: <CAAUH15Ec7DE1kXgrHgJ+Q58XrEkZi--ZNxX3K3c6ss40phQ0Jg@mail.gmail.com>
Subject: teste
From: =?ISO-8859-1?Q?Fl=E1vio_Alves?= <flaviof.alves@gmail.com>
To: flavio <flavio@promotools.com.br>


Content-Type: multipart/alternative; boundary=047d7b677f76f1714d04dd42844a
I did the confirmation by HTML method (mydomain.com.br/zohoverify/verifyforzoho.html) and add MX configuration in my domain host provider (have more than 24h that I made it). Why its not working?