If you suspect a delivery problem, run a message trace from the Microsoft 365 tenant. Check all the transport rules that may apply to the affected mailbox by using step 2 of this article. If an OOF reply appears not to have been sent for all users in the tenant, a transport rule is usually to blame. They include possible fixes and some more frequently seen OOF configuration issues that you may have experienced. The following sections discuss some of the scenarios in which OOF replies aren't sent to the sender. This alternative rule sends a response every time that a message is received. If you want to send a response to the sender every time instead of only one time, you can apply the 'have server reply using a specific message' mailbox server-side rule instead of using the OOF rule. The following table lists the message class and name that are associated with each OOF rule. The rule name is stored in the PR_RULE_MSG_NAME property. Each rule has an associated message class and name. These rules are set individually in the user's mailbox. In addition to using the built-in OOF functionality in their client, people sometimes use rules to create an Out of Office message while they are away.īy design, Exchange Online Protection uses the high risk delivery pool (HRDP) to send OOF replies, because OOF replies are lower-priority messages. If automatic replies are enabled, only one reply is sent to each sender even if a recipient receives multiple messages from a sender. By running a PowerShell command ( Set-MailboxAutoRepl圜onfiguration)Īdmins can set up OOF replies from the Microsoft 365 Admin Portal on behalf of users.By using other clients, such as Outlook on the web (OWA).By using the automatic reply feature from within Outlook as explained here.Therefore, they are triggered regardless of whether the client is running.Īutomatic replies can be configured as follows: OOF, or automatic replies are Inbox rules that are set in the user's mailbox by the client. (If you've ever wondered why 'Out of Office' is abbreviated as 'OOF' instead of as 'OOO,' see However, much of this discussion also applies to an on-premises configuration. How do they work? Why do they sometimes not get delivered to other users, and what do you do if they don't? This article discusses the bits and pieces of OOF replies from the perspective of an Exchange Online configuration.

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