Hi list I wonder if the following idea is somehow "do-able" in postfix. We have a fallback postfix instance which gets all mails that our scanners could not send to our customers target server. Now the fallback tries to submit those msg to our customers. Sometimes our customers do not know how to manage dns and delete an important record (like the a-rec for the target server). We do not manage their zones, that's done by themselves.
Now we thought that it would be very nice if we could "tell" our fallback instance that in case of NXDomain in DNS lookup of a target server to return a DEFER (4xx) instead of a REJECT (5xx). I found soft_bounce parameter in the docs but that seems too wide, as we would only soft bounce in case of NXDomain results of target servers and not for any other reason. Is it possible to use smtp_dns_reply_filter to filter for NXDomain results and return a DEFER action? Thanks for any idea and have a good one -- tobi
signature.asc
Description: OpenPGP digital signature
