Postfix re-route incoming email address

Question

How do i re-route an incoming email address to a our domain using postfix.The mail should not go to spam mail. The sender should get a failure sending message. Can anyone please help me to it.

Answer 1

http://www.postfix.org/pipe.8.html says:

   Postfix  version  2.3  and  later  support  RFC 3463-style
   enhanced status codes.  If a  command  terminates  with  a
   non-zero  exit  status, and the command output begins with
   an enhanced status code, this status code takes precedence
   over the non-zero exit status.

So if you pipe the addreses you want to return fmilures for over to a command and then 1) output an enhanced status code from RFC3463 and then 2) return a non-zero exit code, the sender will get the enhanced status code that you sent.