Configuring rules in EAC or O365

Question

I want to create below rules in EAC / or give me some other way around so below can be achieved, please give step by step procedure to do so -

1. To create a rule to prevent users from sending bulk email at a particular time simultaneously - I want restriction count on users , e.g. Prevent users from sending 100 emails simultaneously.
2. To create a rule to allow email access only through OWA - This rule should be applied on whole tenant and none of the users in the tenant should be be able to access emails other than OWA, whether the person is sender/recipient or anyone else.
3. To create a transport rule to be created on Email having specific keywords and then tagging them as Spam - Also the emails marked as spam should be moved to junk folder
4. To configure Email rule to stop user to make use of his individual mailbox Id to send and receive email and make sure only shared mailbox is accessible.

Thank you in advance for the help!!

Answer 1

I have an idea but I do not have the test tenant to try this out.

The idea can be found here, but requires a variation of the settings.

Tutorial - Protect Exchange Online email on unmanaged devices with Microsoft Intune - Microsoft Intune | Microsoft Learn

If this works, you will first need at a minimum

Microsoft365 Business Premium, Microsoft365 E3, E5 to get conditional access features.

Midway down the website, the tutorial shows you how to restrict access to Exchange Online to Outlook App as the only mail client using conditional access.

You can test a variation if restricting ALL mail clients will block all access (other than OWA) in receiving mail. Let us know if it works.

Regards

Answer 2

Hi,

Thank you for your help,

Point #2 seems to be working as per your suggestion.

But for point #3 and #4, both of them are not working as they are intended to work.

Answer 3

Hello Harsh Jasapara,

Hope this finds you well.

To answer your queries, please see below.

1. To create a rule to prevent users from sending bulk email at a particular time simultaneously - I want restriction count on users , e.g. Prevent users from sending 100 emails simultaneously.

Preventing users from sending bulk email at a particular time isn't yet feasible. However, Exchange online provides a way to customize recipient limits per mailbox. In this way, you can limit the number of recipients a user can put in the To, Cc or Bcc box while sending email. Please refer to this article for more info. Customizable Recipient Limits in Office 365 - Microsoft Community Hub

2. To create a rule to allow email access only through OWA - This rule should be applied on whole tenant and none of the users in the tenant should be be able to access emails other than OWA, whether the person is sender/recipient or anyone else.

This may require building a conditional access policy in Microsoft Entra to restrict desktop apps for Exchange Online. **Target resources >**Office 365 Exchange Online >Conditions > Client apps > Mobile apps and desktop clients

**Grant >**Block Access

More info on how to build the policy here: Building a Conditional Access policy - Microsoft Entra ID | Microsoft Learn

3. To create a transport rule to be created on Email having specific keywords and then tagging them as Spam - Also the emails marked as spam should be moved to junk folder

You can configure a transport rule in EAC specifying the keyword and set the Spam Confidence Level to 5 or above. Example in screenshot below.

4. To configure Email rule to stop user to make use of his individual mailbox Id to send and receive email and make sure only shared mailbox is accessible.

You can configure a rule in this way.

In case you have any further queries, please let me know.

Best Regards,

Ashraf.

Answer 4

Any updates on this??

Answer 5

Dear Harsh Jasapara,

Greetings. Thank you for posting to the Microsoft Community!

With your description, we have carefully examined your issue and we still need more time for further research and testing. Please be patient. We will update the thread accordingly.

Thank you in advance for your patience and understanding, your cooperation will be highly appreciated!

Sincerely,

Ashraf.