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Re: [dmarc-ietf] tree walk and Org and PSD, Second WGLC for draft-ietf-dmarc-psd

John Levine <johnl@taugh.com> Mon, 23 November 2020 21:05 UTC

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From: John Levine <johnl@taugh.com>
To: dmarc@ietf.org
Cc: eric.b.chudow.civ@mail.mil
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Subject: Re: [dmarc-ietf] tree walk and Org and PSD, Second WGLC for draft-ietf-dmarc-psd
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In article <553D43C8D961C14BB27C614AC48FC0312811FC37@UMECHPA7D.easf.csd.disa.mil> you write:
>-=-=-=-=-=-
>
>Even for .mil, the vast majority of email domains are fairly short with four or fewer labels. Most of the other ones tend to be
>individual servers that send automatic performance emails, and I think should be considered more of an edge case and less of our concern.

I scraped my logs for the past few months and that's what I found.
Nearly everything was four labels or less. Spot checking the few
five-label names, I found that most of the mail was all from
MAILER-DAEMON@<long-mailhost-name> and it appeared to be spam
blowback.  There was a trickle of what looked like real mail
from stumail.zcs.k12.in.us and feedback.retail.voice-your-views.hsbc.com,

I found nothing at all with six labels or longer.

So if we made the tree walk limit six or seven I think we'd be
unlikely to lose any mail that anyone would miss.

R's,
John

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