> On 1 Mar 2023, at 09:07, Alessandro Vesely <ves...@tana.it> wrote: > > Thanks to you and Mark! > > > On Tue 28/Feb/2023 19:00:22 +0100 Laura Atkins wrote: >>> On 28 Feb 2023, at 17:51, Alessandro Vesely <ves...@tana.it> wrote: >>> What changes when there is a zone cut (delegation) rather than having >>> sub-subdomains all in the same zone? Controlling inheritance obviously has >>> different tastes depending on the case. Which case is more common? >> >> If it’s a zone cut, then that supports the “bottom-most” policy even more >> than if it’s in the same zone, IMO. > > > For clarity, let me point out that bottom-most refers to the convention that > abstract trees have their roots at the top. IOW, since ret.bmcc is in the > same zone as bmcc it seems better for the former to inherit from the latter > than from its org domain.
Thank you for the clarification. I was adopting the terminology from the post I was responding to rather than confusing the conversation by changing it. > However, in that case both zones are under the same master server: > > cuny.edu. 2801 IN SOA acme.ucc.cuny.edu. > hostmaster.acme.ucc.cuny.edu. 2019022032 3600 1800 2419200 3600 > bmcc.cuny.edu. 300 IN SOA acme.ucc.cuny.edu. > hostmaster.acme.ucc.cuny.edu. 200804826 300 3600 2419200 3600 > ret.bmcc.cuny.edu. (no SOA) > > (Those funny serials cannot begin with the year. We had no DMARC in 2008.) I don’t see how that changes anything. You walk up the DNS hierarchy and stop when you find a DMARC policy statement. You don’t bypass that statement and keep walking, IMO. laura -- The Delivery Experts Laura Atkins Word to the Wise la...@wordtothewise.com Email Delivery Blog: http://wordtothewise.com/blog
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