RestrictExtRecips for Outlook 2013/2016/2019
See also: RestrictExtRecips for Exchange 2013/2016
In Exchange online you can use the EAC or Shell to restrict the number of recipients per message for a mailbox.
There is no way to limit the number of external recipients a certain group of people can send to.
If you run Outlook 2013/2016/2019 on Windows, RestrictExtRecips add-in will solve this problem.
Let's suppose an Exchange online administrator has created a distribution list named "RestrictExtRecips_2". Number 2 after underscore means that each member of this list that runs Outlook with RestrictExtRecips add-in installed cannot set more than 2 external recipients in his message.
If a user adds 3 or more external addresses to the "To:" or "CC:" field then the message will not be sent and Outlook will display a warning pop-up window.
The application is a COM add-in for Outlook.
Current version: 188.8.131.52
Non-restricted: @contoso.com, @contoso.onmicrosoft.com
Make sure you are a member of this list .
Select Start > Control Panel. Select Programs and features. Select RestrictExtRecips in the list. Right-click and select Uninstall. Follow the instructions.
About this demo version.
Q. Will it help us be more GDPR compliant?
A. Yes. As you know, sharing the email addresses with other recipients is a breach of GDPR regulations - have a look at this article: 5 Ways Your Emails Could Breach GDPR. With RestrictExtRecips you can force users to use "BCC:" instead of "To:" and "CC:".
Q. How can I define the number of external recipients?
A. This number is defined by the name of the distribution list.
Q. What happens if the mailbox is a member of several "RestrictExtRecips_XXX" distribution lists?
A. The lowest number has priority over others.
Q. May I hide "RestrictExtRecips_XXX" distribution list from address lists?
A. No, don't do that. As soon as you you hide a distribution list, it becomes invisible for RestrictExtRecips add-in.
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