<div>
Yup,<br />
<br />
ISP had submitted our IP address to the DUL, <br />
<br />
Doh!<br />
<br />
Cheers ikm7176
</div>


Yup,

ISP had submitted our IP address to the DUL,

Doh!

Cheers ikm7176

<div>
<div class="content wysiwyg-content">
<br />
Right, <br />
<br />
Were having a problem with email bounceing back when sent to several organisations stating our IP is dul, the exact message is...<br />
<br />
&nbsp; &nbsp; &nbsp; 'janet.cowling@domain.com'<wbr /> on 10/11/04 12:24<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; There was a SMTP communication problem with the recipient's email server. &nbsp;Please contact your system administrator.<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;server.domain.co.uk #5.5.0 smtp;553-mail rejected because your IP is in DUL. See&gt;<br />
<br />
Now I'm no expert, so correct me if I'm wrong, from looking around it seems this error is usually down to the IP address being on a black list which companies subsribe to to cut down on spam. One problem is usually the response comes back with a company to contact, or even the IP address that is being blocked which the above doesn't.<br />
<br />
The server.domain.co.uk resolves to the IP address of our email/web hosting company and I would doubt that would be blocked, I've been in contact with them and they haven't been incredibly helpfull.<br />
&nbsp;<br />
I've a sneaking suspicion this may be a problem with the setup in our exchange 2000, but not to sure where to start.<br />
<br />
Any help much appreciated. <br />
<br />
<br />
<br />
<br />

</div>
</div>



Right, 

Were having a problem with email bounceing back when sent to several organisations stating our IP is dul, the exact message is...

      'janet.cowling@domain.com' on 10/11/04 12:24
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            <server.domain.co.uk #5.5.0 smtp;553-mail rejected because your IP is in DUL. See>

Now I'm no expert, so correct me if I'm wrong, from looking around it seems this error is usually down to the IP address being on a black list which companies subsribe to to cut down on spam. One problem is usually the response comes back with a company to contact, or even the IP address that is being blocked which the above doesn't.

The server.domain.co.uk resolves to the IP address of our email/web hosting company and I would doubt that would be blocked, I've been in contact with them and they haven't been incredibly helpfull.
 
I've a sneaking suspicion this may be a problem with the setup in our exchange 2000, but not to sure where to start.

Any help much appreciated. 






email bouncing back as the IP is dul

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.