Thanks for the reply.
I looked at this virtual domain, and the problem is that I already have a catchall account setup on my domain.
@example -> email@example.com
so, I was hoping in postfix, I could set up some sort of wildcard address that forwarded "firstname.lastname@example.org" -> email@example.com
so that anything that was emailed to bounce<anything else>@example.com would show up in firstname.lastname@example.org
i guess if all else fails, I could send emails from a sub-domain and have another catch-all on that sub-domain which I could assume would only be bounced-emails. But I would prefer to not have to set up a sub-domain.
Thanks again for any input.