The same message identifiers that are available in conditions are also available in exceptions. For example, if the rule action is to delete the message, removing the conditions and exceptions could cause the rule to delete all inbound and outbound messages for the entire organization.įor more information about mail flow rule conditions in Exchange Online, see Mail flow rule conditions and exceptions (predicates) in Exchange Online.Įxceptions: Optionally identify the messages that the actions shouldn't apply to. If you create a rule without conditions and exceptions, the rule action is applied to all messages. Most conditions require you to specify a comparison operator (for example, equals, doesn't equal, or contains) and a value to match. 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). Conditions: Identify the messages that you want to apply the actions to.Mail flow rule componentsĪ mail flow rule is made of conditions, exceptions, actions, and properties: 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). Messages sent to the arbitration mailbox (like approval request notification).The NDRs created by non-Exchange service will not be detected as NDR by Exchange Mail flow rules and the coresponding Mail flow rules conditions/exceptions will not be matched. Non-Delivery report (NDR) generated by Exchange.Some of the messages that are not processed by Mail flow rules are: System-generated messages do not get processed by your organization's mail flow rules (or transport rules).
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