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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