[Discuss] Rejecting vs. bouncing with postfix

[Edward Ned Harvey (blu)]

> From: discuss-bounces+blu=nedharvey.com at blu.org [mailto:discuss-
> bounces+blu=nedharvey.com at blu.org] On Behalf Of Rich Braun
> 
> Question:  how to I configure postfix on my inbound relay(s) to 550-reject
> messages sent do any address that isn't defined in that virtusertable?

This sounds extremely postfix-specific.  Have you tried talking to them?
http://www.postfix.org/lists.html