Overriding MX records to internal gateways

[Pedro Espinoza]

Gurus:

is it possible with BIND to replace authoritative MX records with
internal gateways, so that the MTA can route the email to internal
gateways? Of course, sendmail/postfix provides a solution to do that.
But I am looking at DNS level, as follows:



;; QUESTION SECTION:
;gmail.com.                     IN      MX

;; ANSWER SECTION:
gmail.com.              870     IN      MX      10 localrelay1.example.com.
gmail.com.              870     IN      MX      50 localrelay2.example.com