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error #5.3.0 when sending emails to a certain domain

Posted on 2006-11-10
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Last Modified: 2012-05-05
We are having a problem sending emails to one domain, bt.com. When we send an email to anyone at bt.com we receive the following bounce back

The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
            < *.*.com #5.3.0>

We have not changed anything on our systems, we are currently running exchange 2003, and MIMEsweeper for SMTP Version 5.0.

I have no idea what to do, I currently set up a reverse dns entry after the error occured, and I can't get through to anyone at bt. Could anyone else sugegst anything?

Cheers

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Question by:dejul23
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Accepted Solution

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Sembee earned 250 total points
ID: 17913939
Was that it in the NDR? Just the host name and the error code? Nothing else?
Try putting in an SMTP Connector to route email via your ISP for that domain. See if the problem follows.

Simon.
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Author Comment

by:dejul23
ID: 17914100
Nice one

I set up an smtp connector to direct bt emails via dns rathar than through mailsweeper, and the emails are delivered. Does this mean there could be a problem with the routing/config on mailsweeper?

Cheers

Dej
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Author Comment

by:dejul23
ID: 17914107
Ps there is nothing else on the report

Your message did not reach some or all of the intended recipients.

      Subject:      

The following recipient(s) could not be reached:

      <removed by sembee> @bt.com on 09/11/2006 18:29
            The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
            < *.*.com #5.3.0>
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LVL 104

Expert Comment

by:Sembee
ID: 17914271
The next thing you could try is to see whether the Mailsweeper application can send email to BT through the ISPs smart host. If that fails, then mailsweeper is culprit. I haven't used Mailsweeper so don't know if it can use a smart host or not.

Simon.
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Author Comment

by:dejul23
ID: 17914369
Thanks guys, i'll see if I can get mailsweeper to send to bt, I'm also looking at the a record, as the server does not have one.

Dej
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