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Re: [dmarc-ietf] Thoughts on choosing N

John Levine <johnl@taugh.com> Thu, 18 April 2024 01:20 UTC

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From: John Levine <johnl@taugh.com>
To: dmarc@ietf.org
Cc: todd.herr@valimail.com
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Subject: Re: [dmarc-ietf] Thoughts on choosing N
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It appears that Todd Herr  <todd.herr@valimail.com> said:
>When DMARC was first developed, there was concern about DNS load and
>needing to minimize DNS lookups. Operational expertise now shows that this
>is no longer cause for concern.
>
>Short circuiting a tree walk has led to many issues, like a reliance on the
>PSL, complicated algorithms for Org Domain discovery, ...

I have to say I have some sympathy for just taking out the limit and
if you sometimes need to walk umpteen levels on stupid domains, so be
it.

Or I suppose say if there's more than 8 components in the name, just stop because no domain
actually used for mail is that deep.  Take out the skip stuff.

R's,
John

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