nslookup and internal server

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I recently switched a domain from one web server to another web
server.

I received complains that people of a company cannot send email to
this
domain. After musch hassle I discovered later that the company
maintains its own server.

By typing 'nslookup' at command prompt, the default DNS server points
to its windows server.

I guess that its windows server has not updated its DNS record even
after more than a week. Am I correct on this ?

Should the IT department of the company do something to update its DNS
record.

I could be widely off mark. Do elaborate. Thanks.

.

Relevant Pages

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    ... Thanks, but it doesn't make sense to be DNS, otherwise I wouldn't be able to ... We created a new virtual directory on the web server (which is externally ... Reference to the service's external URL ...
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