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Re: [Uta] I-D Action: draft-ietf-uta-rfc7525bis-07.txt

John Levine <johnl@taugh.com> Thu, 23 June 2022 16:44 UTC

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From: John Levine <johnl@taugh.com>
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Subject: Re: [Uta] I-D Action: draft-ietf-uta-rfc7525bis-07.txt
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It appears that Peter Saint-Andre <stpeter@stpeter.im> said:
>On 5/27/22 7:51 AM, Stephen Farrell wrote:
>
>> - section 3.2: I wondered why no mention of MTA-STS or
>>    DANE? Could/should we say that MTA implementations
>>    SHOULD include support for such strictness?
>
>Hi Stephen,
>
>Although these technologies (RFC 8461 and RFC 7672) seem sensible, I 
>don't think we authors have a good handle on whether they are widely 
>deployed enough to justify a SHOULD in a BCP. We will reach out to folks 
>in the email community for guidance.

MTA-STS is in wide use.  All of the large mail systems I know publish
mta-sts records and a lot of the smaller ones.

DANE is less widely used but Viktor would have the numbers.  I know that
Comcast buth publishes DANE records and checks them on their outbound mail
so they might be willing to share some observations.

R's,
John

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