On Wed, Dec 3, 2014 at 1:51 PM, Wietse Venema <wie...@porcupine.org> wrote: > Jose Borges Ferreira: >> This is the scenario. >> Box 1 : just receive email from "outside" - inbound flow. >> Box 2 : used to sent email to the "outside" - oubound flow. > > Inbound MTA: primary MX for your domain(s). If mail can't be > delivered, use Postfix's relayhost feature to deliver outbound mail > via the outbound MTA, if you can't use standard MX logic to deliver > directly to the sender's MX hosts.
That's my initially idea, but was afraid that relayhost would "catch" more than intended. That's why I asked about a way just to apply the relayhost behavior to server generated messages (bounces). > Outbound MTA: if mail can't be delivered, use standard MX logic to > deliver NDRs to the sender's MX host(s). > That's was already covered, because email loops back through the InboundMTA Thanks. José Borges Ferreira
