<div>
Do any of those email addresses exist?<br />
<br />
webmaster/root/postmaster/<wbr />info?
</div>


Do any of those email addresses exist?

webmaster/root/postmaster/info?

<div>
nope<br />
is that the problem?<br />
cause i can receive all email. 
</div>


nope
is that the problem?
cause i can receive all email.

<div>
<div class="content wysiwyg-content">
Hi guys,<br />
<br />
I have exchange 2007 on server 2003<br />
I can send/receive emails but when I do a dnscheck, it gives me this result<br />
<br />
&nbsp;Domain <a href="http://www.com.sg" rel="ugc">www.com.sg</a>&nbsp;has only one mail-server &nbsp;<br />
&nbsp; Checking mail server (PRI=30) <a href="http://www.com.sg" rel="ugc">www.com.sg</a>&nbsp;[116.12.179.37] &nbsp;<br />
&nbsp; Mail server <a href="http://www.com.sg" rel="ugc">www.com.sg</a>[IP address] answers on port 25 &nbsp;<br />
&nbsp; &lt;&lt;&lt;&nbsp;220 webmail.<a href="http://www.com.sg" rel="ugc">www.com.sg</a> Microsoft ESMTP MAIL Service ready at Mon, 16 Jun 2008 12:56:59 +0800 <br />
&nbsp; &gt;&gt;&gt;&nbsp;HELO <a href="http://www.checkdns.net" rel="ugc">www.checkdns.net</a>&nbsp;<br />
&nbsp; &lt;&lt;&lt;&nbsp;250 webmail.<a href="http://www.com.sg" rel="ugc">www.com.sg</a> Hello [195.60.98.252] <br />
&nbsp; &gt;&gt;&gt;&nbsp;MAIL FROM: &lt;dnscheck@uniplace.com&gt; <br />
&nbsp; &lt;&lt;&lt;&nbsp;250 2.1.0 Sender OK <br />
&nbsp; &gt;&gt;&gt;&nbsp;RCPT TO: &lt;postmaster@<a href="http://www.com.sg" rel="ugc">www.com.sg</a>&gt; <br />
&nbsp; &lt;&lt;&lt;&nbsp;550 5.1.1 User unknown <br />
&nbsp; &gt;&gt;&gt;&nbsp;RCPT TO: &lt;root@<a href="http://www.com.sg" rel="ugc">www.com.sg</a>&gt; <br />
&nbsp; &lt;&lt;&lt;&nbsp;550 5.1.1 User unknown <br />
&nbsp; &gt;&gt;&gt;&nbsp;RCPT TO: &lt;info@<a href="http://www.com.sg" rel="ugc">www.com.sg</a>&gt; <br />
&nbsp; &lt;&lt;&lt;&nbsp;550 5.1.1 User unknown <br />
&nbsp; &gt;&gt;&gt;&nbsp;RCPT TO: &lt;webmaster@<a href="http://www.com.sg" rel="ugc">www.com.sg</a>&gt; <br />
&nbsp; &lt;&lt;&lt;&nbsp;550 5.1.1 User unknown <br />
&nbsp; Probably mail server does not accept mail for <a href="http://www.com.sg" rel="ugc">www.com.sg</a>&nbsp;(received status 550) &nbsp;<br />
&nbsp; Some of your MX do not work properly &nbsp;<br />

</div>
</div>


Hi guys,

I have exchange 2007 on server 2003
I can send/receive emails but when I do a dnscheck, it gives me this result

 Domain www.com.sg has only one mail-server  
  Checking mail server (PRI=30) www.com.sg [116.12.179.37]  
  Mail server www.com.sg[IP address] answers on port 25  
  <<< 220 webmail.www.com.sg Microsoft ESMTP MAIL Service ready at Mon, 16 Jun 2008 12:56:59 +0800 
  >>> HELO www.checkdns.net 
  <<< 250 webmail.www.com.sg Hello [195.60.98.252] 
  >>> MAIL FROM: <dnscheck@uniplace.com> 
  <<< 250 2.1.0 Sender OK 
  >>> RCPT TO: <postmaster@www.com.sg> 
  <<< 550 5.1.1 User unknown 
  >>> RCPT TO: <root@www.com.sg> 
  <<< 550 5.1.1 User unknown 
  >>> RCPT TO: <info@www.com.sg> 
  <<< 550 5.1.1 User unknown 
  >>> RCPT TO: <webmaster@www.com.sg> 
  <<< 550 5.1.1 User unknown 
  Probably mail server does not accept mail for www.com.sg (received status 550)  
  Some of your MX do not work properly  


Problems with exchange 2007 : status 550

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.