On Thu, Jul 09, 2015 at 07:43:17PM +0200, Alexandre Ellert wrote: > I have an inbound MX in front of an Exchange Server and I?d like to DISCARD > email when Exchange answer "554 5.1.0 Sender Denied" (and avoid backscatter) > Is it possible to do something like that with Postfix ?
No. Instead work with the Exchange administrators to not do that,
the relevant access control policy should be implemented in the
public MX host, rather than on internal mail relays.
--
Viktor.
