The only way to make this work if you're using your domain for mail today (meaning like Office 365, Google, or some VPS running mail) is to use multiple mail servers.
So you might have me@mydomain.com, noreply@mydomain.com, etc all pointing to mx.mydomain.com (Google for example). That stays as-is so as not to disrupt existing mail. Anything related to the IPB community could be noreply@SOMETHING.mydomain.com. Basically a vanity address pointing to something controlled by IPS. something.mydomain.com could point to a mail server that is controlled by IPS that could receive the bounces and maybe even forward inbound to me@mydomain.com. Or instead of forwarding inbound email, possibly pipe it into Commerce into a ticket queue.