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Re: [dmarc-ietf] NXDOMAIN

John Levine <johnl@taugh.com> Tue, 06 April 2021 00:45 UTC

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Date: Mon, 05 Apr 2021 20:45:42 -0400
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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] NXDOMAIN
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It appears that Todd Herr  <todd.herr@valimail.com> said:
>Several jobs ago, when I was in position to set anti-spam policy for a
>mid-sized US-based cable ISP, if the RFC5321.From or RFC5322.From domain
>lacked both an MX record and an A/AAAA record, that was enough for me to
>reject the mail on the grounds that I was unwilling to accept anything to
>which the recipient could not reply. I don't recall any complaints from my
>side of the transaction.

On my small system I have the same experience.  Nobody sends mail that you
want from nonexistent domains.

>I'm not sure I'd make the same decision based on the lack of an SPF record,

I certainly wouldn't. I get plenty of mail from addresses with no SPF
record. I think some of it is even DKIM signed.

R's,
John

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