Exchange email queue stuck in message queue viewer with error “451.4.04 DNS query failed”

HI folks,
Yesterday I was in office and one salse officer report one email issue. - he was send mail to one client id but that mail was not received by client.
basicaly I told just give me a exact time and recipient details (Email ID) that officer reply me with all details.
then I start my troubleshooting.. step by step..
1) I was checked organization mails in/out working ... OK
2) opened mail tracking and provide all inpute for mail tracking... Oppps mail was not found in tracking log..
3) Then I run to message queue viewer ... and i found for that domain mails queue are in retry status.
I expand queue viewer and check what is last error. Error was - 451.4.04. DNS query failed
 
Then I was checked MX records are resolving for that doamin. run the command prompt.
> Nslookup
>set q=mx
> domain name.com {Enter} and result in attached snap.. . Booom
 
 
I come to know that is issue happened due to mx record not resolving and query not fowording to my local dns server. My dns server not quering to global dns server for this doamin...
1) Facts
        My DC DO NOT have any Forwarders to our DNS & go directly to Root hints
             Name Servers of - domain.com are
i) ns.deeproot.in
ii) b.ns.deeproot.in
2. ) Observation during issue (initial)
NS points to a Communications company abc.com.
There is NO MX Record in the abc.com Resolution
 
This occurs transiently & sometimes Network Tools again Resolves back to the Correct IP Address
 
However if local DNS resolves the abc.com IP initially, it gets stored in the Cache & the mail flow will stop.
 
Clearing the cache resolves the above Situation & mail flow starts again as correct IP is resolved.
 
Workaround
Either Forward DNS Queries primarily to our DNS Servers which in turn forwards to Google Public DNS
OR
To directly refer DNS Requests to Google Public DNS
 
I have done : DNS Requests to Google Public DNS
 
Now Email flow working fine for this doamin... (finanly issue resolved)

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