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Intermittent DNS Errors - bounce backs received on emails

TheSonicGod asked
Last Modified: 2015-09-30
Hi Everyone:

We are experiencing intermittent errors (very frustrating) with email that seemed to have started yesterday.
Emails being sent to domain cipherpharma.com fail intermittently showing up as DNS errors.  It works and then it doesn't work.

Error received is as follows:
Sorry, I couldn't find any host named cipherpharma.com. (#5.1.2)

The nameservers are with Netfirms (ns1.netfirms.com and ns2.netfirms.com) and nothing has changed on the settings in several years.
I have contacted Netfirms to see if any issues on their end, and of course, they indicated that their dns servers are fine.
Having said this, when I check the domain on mxtoolbox.com it shows the correct DNS entries but if I refresh the tool, every so often I get an error that shows: "No records exist" when reporting from ns2.netfirms.com (ns1.netfirms.com always show the correct dns records).

I'm not sure where to go from here.  Netfirms (after 5 or so calls to them) says nothing is wrong on their end.
What other tools would you suggest I use to diagnose this?
Or what would your next step be?

I'm hoping someone out there can help as I've been on this since last night and am running out of ideas, short of moving the domain to a different registrar and name servers; however, that is my last resort!

Thanks for your feedback.

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