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Issue sending e-mails to certain domain

doug.dockter
Level 1
Level 1

I'm having an issue sending e-mails to domain capitaliii.com from my Ironport.  I see the following message in the Ironport log.

"DNS Temporary Failure capitaliii.com MX - unable to reach nameserver on any valid IP"

When I issue a nslookup on the MX record from the Ironport, I get the below message.

Temporary query error:  "unable to reach nameserver on any valid IP" looking up A record for "capitaliii.com" to nameserver
ns3.digipark.com


I can however do a successful a successful nslookup from my workstation.  See the results below.  Any ideas?  I've done
a flushdns on the Ironport to no avail.

Non-authoritative answer:

capitaliii.com  MX preference = 10, mail exchanger = mail1.digipark.com

mail1.digipark.com      internet address = 64.111.26.141
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