How can I prevent users from adding non-agency mailboxes to Outlook?

Question

Hello,

I understand if you disable IMAP and POP that prevents users from adding gmail, yahoo, etc. accounts. However, it does not seem to prevent users from adding non-agency Outlook accounts.

I want to prevent users from adding ALL non-agency email accounts to their Outlook. I only want them to be able to add accounts within our agency/company domain.

Ex: Users with proper permissions could add User1@busybusiness.com and MarketingGroup@busybusiness.com.
Users CANNOT add PersonalAccount@harsh.com .com or MySecondJob@realestate.com

Is there a way to do this?

Answer

Hi @SomeITGuyPinkFloyd ,

Welcome to our forum!

Based on my test and research, I didn't find a method to restrict users from adding private accounts. But we can try the following two workarounds:
1.After the user adds the work accounts(User1@busybusiness.com and MarketingGroup@busybusiness.com), disable the access to add accounts.
2.Limit the number of accounts that a user can add in Outlook client.

If you need, please try the steps below:
For the first--disable the access to add accounts:
Please refer to my answer in this thread: Can you lock Outlook to only one account ? My company is using Outlook as a Business e-mail app.

For the second--limit the number of accounts that a user can add in Outlook client:
1.Open Registry Editor and locate the path, if the path can't be found, please try to manually create the path and values like below:

Registry Path: HKEY_CURRENT_USER\SOFTWARE\policies\MICROSOFT\EXCHANGE  
Value Name: MaxNumExchange  
Value Type:REG_DWORD  
Value:type the number that you want to limit

2.After step1, restart Outlook.
3.Then when adding more than this number of accounts, the following error occurs.

(Note: Serious problems can occur if you modify the registry incorrectly. Before making changes, back up the registry to restore it in case something goes wrong.)

Hope the above help!

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How can I prevent users from adding non-agency mailboxes to Outlook?

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