My comments are based on some of the traffic sources we see to various
RBL's, and Cisco's assertion that the traffic from their DNS servers is
not their in-house use, but that of customers adding RBL's manually to
their devices.
Seems that IronPort custoemrs don't know enough, or worry enough to
think about changing the DNS servers they use.
On 2025-05-15 05:36, Robert Giles via mailop wrote:
No, Ironports will use whatever DNS servers you specify.
Also, I don't believe it's typical to employ third-party RBLs with
Ironports; Cisco's SBRS is pretty good alone, IMO.
Scott Q: not sure if you're aware, but there's a very coarse reputation
check you can do here for your sending IP:
https://talosintelligence.com/reputation_center/
You won't get the raw SBRS score, but it will give you an idea.
Robert
On 5/14/2025 at 17:28, Michael Peddemors via mailop wrote:
The only thing is ..
I believe Cisco devices all use the Cisco DNS servers for all RBL
lookups, rather than their own DNS servers.. Is this a correct
assumption? This can cause problems for some people with some RBL's.
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