If you already have full access to a shared mailbox, you have the ability to change the 'Out of Office' automatic message on that account or add rules to the mailbox.
Please note, that if you make those changes to a shared mailbox, then ALL users who access messages on that mailbox would be affected by these changes.
To do so, you have to access the account in a particular way. It cannot be done through your usual method of accessing the mailbox in Webmail or Outlook.
Instructions
Follow these steps:
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Login to your own Webmail account
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Click your profile picture in the top right of the Webmail page.
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Select "Open another mailbox"
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In the new box that opens, type in the name of the shared mailbox.
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Click on that name once it's found in the listing, then click "Open".
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That will open the shared mailbox in a new Webmail tab.
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On that new tab, you can click the gear icon near the top right for Settings.
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From there you can go to 'Mail', then "Automatic Replies" or "Rules" to make the changes.
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