To configure a vacation message for a mailbox in the admin panel:

  1. In the list of mail accounts, click Modify for the account you want to configure.
  2. In the Forwards/Vacation section, check the box next to Enable Vacation Message.
  3. Create or edit a vacation message.
  4. Click the Modify Email Account button.

Please note that if the box next to “Deliver to” is not checked, mail will not be delivered to the mailbox itself.