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09.19.2007 at 01:35AM PDT, ID: 22838060
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Exchange 2007 error - 451 4.4.0 DNS Query Failed

Asked by museudf in Exchange Email Server, Domain Name Service (DNS)

Tags: 451, dns, query, exchange, failed

Hi all

I have just setup a new Exchange 2007 mail platform. Everything is working fine internal and I have just configured my send connector to route emails out via my smart host (MessageLabs). When I send an external message I can see it in the queue viewer and I can see that its going to the right place but it sits there for about 8 minutes and then finaly does go and I see it in my hotmail/gmail inbox. During those 9 minutes I can see that it keeps retrying every now and then and in the last error field it says the following:

451 4.4.0 DNS Query Failed

Can anyone explain why this is happening. why does it take so long to send the email out and what is wrong with the DNS that is is complaining about.

Your help in this matter would be great.

many thanks

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[+][-]09.19.2007 at 01:49AM PDT, ID: 19919033

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[+][-]09.19.2007 at 03:00AM PDT, ID: 19919271

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[+][-]09.19.2007 at 05:46AM PDT, ID: 19920083

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[+][-]09.20.2007 at 06:46AM PDT, ID: 19928240

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About this solution

Zones: Exchange Email Server, Domain Name Service (DNS)
Tags: 451, dns, query, exchange, failed
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Solution Provided By: Chris-Dent
Participating Experts: 2
Solution Grade: C
 
 
[+][-]09.23.2007 at 08:28AM PDT, ID: 19944528

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