Restrict Office 365 users to internal email only
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Use a mail flow rule through the Office 365 administrator portal.
Steps taken verbatim from: https://www.itprotoday.com/identity-access-management/how-block-users-sending-email-outside-organization-exchange-online
- Log on to your office.portal.com as the administrator
- Go to admin center
- Expand admin center and click Exchange
- Click "Rules" under "Mail flow" category
- Click "+" to create a new rule
- Fill in the rule name
- Choose "The recipient is located" from "Apply this rule if" drop down.
- Choose "Outside the organization" when a new window opens and then click OK.
- Click "More Options" to change other options.
- Choose "Reject the message with the explanation" from "Do the following" drop down.
- Type a message in the new window and click OK.
- Click Save.
Author by
3-14159265358979323846264
Updated on September 18, 2022Comments
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3-14159265358979323846264 over 1 year
As the title suggests, I have a group of users that I want to prevent from sending external emails.
I have created an Office 365 group, and added the required users to it. As administrator, I am the owner of the group, and therefore must be a member.
The problem is that I want the administrator account to be able to send external emails!
I could make one of the users the group owner, but then as owner they could add/remove users, which is obviously a security issue.
What is the best way to get around the problems I have described?
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3-14159265358979323846264 almost 6 yearsThat's what I'm creating the group for ... to list the users that I want to apply the rule to, or am I missing something?! Thanks!
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Kinnectus almost 6 yearsYou might be able to add extra conditions - step 7. You may be able to add the group. You'll probably need an exception for the administrator. Personally I'd have a separate group that can be listed as the group admin and the members would be trusted individuals. Create your exception to use the group rather than the individuals - you can then add/remove users as necessary and keep your rules clean.