Regarding The external & internal DNS

[Ashish Kumar Batwara]

Hello,
we are having two internal DNS server, one is primary & other one is
secondary.
In addition to that one internal mail server is also there. On top of
that we are having firewall, which interacts with external network(DNS
as well as mail server).
If i am having some hosts in the internal network & they wants to
send/receive mails to/from each other, then is it require that their MX
record should be there in the internal DNS????


Regards
---------
Ashish



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