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Re: [dmarc-ietf] Ticket #1 - SPF alignment

Alessandro Vesely <vesely@tana.it> Thu, 31 December 2020 14:46 UTC

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From: Alessandro Vesely <vesely@tana.it>
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Subject: Re: [dmarc-ietf] Ticket #1 - SPF alignment
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On Wed 30/Dec/2020 22:06:01 +0100 John R Levine wrote:
>> We would like to close this ticket by Dec 15, two weeks from now, so short 
>> trenchant comments are welcome.
>>
>> Ticket #1 is about SPF alignment.  We need to replace references to 4408 with 
>> 7408, ando clarify what if anything we do with SPF HELO checks if
>> the MAIL FROM is null.  One possibility is to say only MAIL FROM SPF counts, 
>> if you want to align your bounces, sign them.  The other is to explicitly say 
>> that HELO alignment is OK on bounces.
> 
> I didn't hear a lot of strong opinions, but I think they leaned in the 
> direction of only checking the MAIL FROM, since the name of the MTA often is 
> unrelated to the From: domain.
> 
> This means that if you want your bounces to be DMARC aligned, they'd need DKIM 
> signatures.


Bounces with HELO mta.example.com should have From: postmaster@mta.example.com, 
where example.com may be a virtual domain or the "real" domain name, depending 
on the configuration.


Best
Ale
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