Custom mail reject message

We configured a catch-all email for our domain and add individual emails from users that left our company to the recipients blocked list, so they bounce back to the sender instead of being delivered to catch-all. This works great and the emails get rejected with:

554 5.2.3 MailPolicy violation Error delivering to mailboxes

I'd like to ask is for a feature that allows us to customize the error message. It would be great being able to change it so we can let the sender know that the mailbox does not exist anymore instead of the generic policy violation error.

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