We have a frequent business partner that uses Cisco IronPort for email scanning/filtering. We use Zscaler for incoming and outgoing email delivery.
The Cisco IronPort product gives a high SBRS score if the sending server does not provide an Authoritative response to Reverse DNS lookup.
Zscaler says "There is nothing wrong with non-authoritative answers. You get authoritative answers if the responding DNS is responsible for that zone".
I use mstoolbox.com and never get an Authoritative response when I am checking Zscaler's servers.
I am looking for any information you can provide me with the differences with Authoritative vs non-Authoritative responses to DNS reverse lookup.
IsZscaler's response (in quotes above) correct?
Is it appropriate or common for an incoming email to receive a higher SPAM (SBRS) score because its sending server does not provide an Authoritative reverse DNS response?
If you have come across a situation where you need to find some EDB mailbox recovery techniques, then here you will find the same.
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Among the most obnoxious of Exchange errors is error 1216 – Attached Database Mismatch error of the Jet Database Engine. When faced with this error, users may have to suffer from mailbox inaccessibility and in worst situations, permanent data loss.
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