How to suppress an unwanted external Autodiscover lookup?

Posted by chris on Server Fault See other posts from Server Fault or by chris
Published on 2012-12-26T09:54:57Z Indexed on 2014/08/22 4:22 UTC
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exchange

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outlook

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autodiscovery

In a small network with Exchange 2007, when starting Outlook 2010 (and once in a while afterwards), users get a prompt to confirm that it's safe to get account configuration information from cpanelemaildiscovery.cpanel.net/autodiscover/autodiscover.xml (I could read in a couple of forums that there is a bug in cpanel, but that's beside the point.)

I'm puzzled because I can't find any autodiscover DNS entries anywhere, neither internally nor externally. The only hint is that we use an external hosting company for our website and for one single email address, which runs on cpanel. So I guess that Outlook makes an external DNS query to test all entries? It reates a lot of confusion for the users and frankly I'm not too happy that the external hosting company gets contacted by all our users.

How can I suppress this behavior?

Thanks

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