This page explains how to configure automatic replies (out-of-office messages) on a shared mailbox through the Microsoft 365 admin portal. It is intended for ALTA administrators or anyone with access to the Microsoft 365 admin center who needs to set up auto-replies on behalf of a shared mailbox or user.
Sign in to the Microsoft 365 portal.
Locate Users > Active users (or Groups > Shared mailboxes if you set this on a shared mailbox).
Select a user who has a Microsoft Exchange mailbox.
On the flyout menu on the right, locate Mail settings > Automatic replies (if it's a shared mailbox, just locate Automatic replies on the flyout).
Made with DASH A.i.Follow these steps in the Microsoft 365 admin portal to enable automatic replies on a shared mailbox or user mailbox.
Step-by-step breakdown:
Shared mailbox shortcut: When working with a shared mailbox, the Automatic Replies option appears directly on the flyout — you do not need to navigate through "Mail Settings" first. This saves a step compared to the standard user mailbox flow.
In practice, before setting an automatic reply, confirm with the team or mailbox owner what the reply message should say, how long it should be active, and whether it should apply to senders inside the organization, outside, or both.
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