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we would like to implement an email system architecture where all the messages sent to our customers accounts on SmarterMail go to an MX server that forwards all them to SM (and if the MX server goes down, emails go directly to SM). But all bounce emails for delivery failure from SM (e.g. recipient email address doesn't exist) are sent back to the MX server that DOES NOT forward them to the original sender.
Is it possible to get SM to send the bounce emails directly to the original sender without passing through the MX? If not, do you have other solutions?