<div>
I have one blacklisted entry<br />
&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="http://www.uceprotect.net/en/" rel="ugc">http://www.uceprotect.net/en/</a>&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dnsbl-3.uceprotect.net &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BLACKLISTED &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br />
and the reason for blacklisting is <br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WARNING: No matching A-Record exists for your Reverse-DNS.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DNS is INCONSISTENT.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Please request your Admin or Provider to fix this.<br />
<br />
I guess this is going back to my ISP, unfortunately i m having very hard time with them since they &nbsp;have a monopoly.<br />
Oh well i guess will have to wait n see what happens.
</div>


I have one blacklisted entry
       http://www.uceprotect.net/en/ [http://www.uceprotect.net/en/]        dnsbl-3.uceprotect.net        BLACKLISTED         
and the reason for blacklisting is
          WARNING: No matching A-Record exists for your Reverse-DNS.
          DNS is INCONSISTENT.
          Please request your Admin or Provider to fix this.

I guess this is going back to my ISP, unfortunately i m having very hard time with them since they  have a monopoly.
Oh well i guess will have to wait n see what happens.

<div>
Yes, unfortunately only your ISP can maintain your RDNS. &nbsp;I hope that they are helpful.
</div>


Yes, unfortunately only your ISP can maintain your RDNS.  I hope that they are helpful.

<div>
Thank you so much for your help. God Bless
</div>


Thank you so much for your help. God Bless

<div>
Thanks for the robotex link. Its helped me out! better then mxtoolbox
</div>


Thanks for the robotex link. Its helped me out! better then mxtoolbox

<div>
<div class="content wysiwyg-content">
Hi <br />
<br />
we have Exchange 2003 Sp2<br />
when we sent to one client are emails are coming back with error <br />
<br />
&nbsp;There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.<br />
<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;Our_Exchange_Server.com #5.5.0 smtp;571 Delivery not authorized, message refused&gt;<br />
<br />
thank you<br />
<br />

</div>
</div>


Hi 

we have Exchange 2003 Sp2
when we sent to one client are emails are coming back with error 

 There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.

            <Our_Exchange_Server.com #5.5.0 smtp;571 Delivery not authorized, message refused>

thank you



#5.5.0 smtp;571 Delivery not authorized, message refused

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.