[Pdns-users] Reverse Lookup zone subnetted

[Brian Candler]

On 19/07/2019 15:52, bryantz-pdns at 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.