On 19/07/2019 15:52, bryantz-p...@zktech.com wrote:
Where we are getting into issues is that customers we host e-mail servers for are having issues as some email service providers appear to be forcing their reverse lookups directly against our powerdns servers.
Can you provide your evidence for that assertion? Do you have packet captures?
I can't see any way they could know about your nameservers, unless they followed the in-addr.arpa delegation which ended up with your CNAME.
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