Configuring Exchange Online Mail Flow Rules - Untold.IT


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Thursday, August 13, 2020

Configuring Exchange Online Mail Flow Rules

 You can use mail flow rules (also known as transport rules) to identify and take action on messages that flow through your Exchange Online organization. Mail flow rules are similar to the Inbox rules that are available in Outlook and Outlook on the web. The main difference is mail flow rules take action on messages while they're in transit, and not after the message is delivered to the mailbox. Mail flow rules contain a richer set of conditions, exceptions, and actions, which provides you with the flexibility to implement many types of messaging policies.

This article will guide you on the step-by-step process of creating a mail flow rule.

1. In a web browser, using a work or school account that has been granted global administrator permissions, sign-in to Office 365.

2. Choose the Admin tile.

3. In the Microsoft 365 admin center, choose Admin centers > Exchange.

4. In the Exchange admin center: mail flow > rules > + > Create a new rule.


Rule that applies the Do Not Forward option to emails that are labeled General when they are sent outside the organization

In this example, the General label has a GUID of 0e421e6d-ea17-4fdb-8f01-93a3e71333b8. Substitute your own label or sublabel GUID that you want to use with this rule.

In the Azure Information Protection policy, this label has been configured as the default label to classify emails as General and the label does not apply for protection.

1. In Name, type a name for the rule, such as Apply Do Not Forward for General emails sent externally.

2. For Apply this rule if: Select The recipient is located, select Outside the organization, and then select OK.

3. Select More options, and then select add condition.

4. For and: Select A message header, and then select includes any of these words:

a. Select Enter text and enter msip_labels.

b. Select Enter words, and enter MSIP_Label_0e421e6d-ea17-4fdb-8f01-93a3e71333b8_Enabled=True

c. Select +, and then select OK.

5. For Do the following: Select Modify the message security > Apply Office 365 Message Encryption and rights protection > Do Not Forward, and then select OK.

Your rule configuration should now look similar to the following:

6. Select Save.

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