Other conditions examine message properties (for example, the message subject, body, attachments, message size, or message classification). Some conditions examine message header fields (for example, the To, From, or Cc fields). Mail flow rule componentsĪ mail flow rule is made of conditions, exceptions, actions, and properties:Ĭonditions: Identify the messages that you want to apply the actions to. To implement specific messaging policies by using mail flow rules, see Mail flow rule procedures in Exchange Online. To learn more about the testing options, see Test mail flow rules in Exchange Online and Policy Tips (policy tips aren't available in standalone EOP).įor summary and detail reports about messages that matched mail flow rules, see Use mail protection reports to view data about malware, spam, and rule detections. For each rule, you have the option of enforcing it, testing it, or testing it and notifying the sender. This article explains the components of mail flow rules, and how they work.įor steps to create, copy, and manage mail flow rules, see Manage mail flow rules. 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. The main difference is mail flow rules take action on messages while they're in transit, not after the message is delivered to the mailbox. Mail flow rules are similar to the Inbox rules that are available in Outlook and Outlook on the web (formerly known as Outlook Web App). In Exchange Online organizations or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, you can use mail flow rules (also known as transport rules) to identify and take action on messages that flow through your organization.

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