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Outlook 2007 unable check exchange user name.

Outlook 2007 , Windows 7 64bit Home
Exchange 2010 SP3 , DNS :
When I'm in the company , connecting to the network , my outlook works with no problem .
If DNS of my network interface is set to : . ( DC ,GC, DNS SERVER)
I can add another exchange account to outlook with no problem
However,when I set the DNS to or others,I can't add another exchange account.
I chose manually set up exchange account , when I click check name button , it said:
The action cannot be completed. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.
If I change dns to , it can resolve the name with underline with no problem.
Weird part is if I set the DNS to , my already-created exchange account works without problems.

How to resolve this problem . I can't add exchange account when I'm outside my company . ( Not connect to VPN)

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8/22/2022 - Mon