Rewriting the Message To seems to have no characteristics that are likely to 
cause messages to be blocked as not trustworthy.

This approach will not be detected as anomalous by an incoming gateway.   
Messages to BCC recipients and messages to non-modifying distribution lists are 
already received with the message From address being different from the SMTP 
RCPT address.

Since a user knows that a received message is for himself, a message that 
reports "To" as someone other than himself may cause minor confusion, but is 
not likely to cause significant misunderstanding..

In sum, no one seems to be concerned about the integrity of the "To" header 
currently, and there is no obvious reason why we would expect this to change in 
the future.

For mailing lists that are insist on editing submissions, changing SMTP MAIL 
FROM and Message From into the list domain, and the Message To into the author 
domain, will solve the sender authentication problems created by doing so.   
Just as importantly, it requires no special pleading to participant domain 
administrators.

DF



----------------------------------------
From: jesse.thompson=40wisc....@dmarc.ietf.org
Sent: 7/10/20 6:22 PM
To: dmarc@ietf.org
Subject: Re: [dmarc-ietf] Setting From: MLM, To: author, Bcc: subscribers
On 6/29/20 4:18 AM, Alessandro Vesely wrote:
> Hi all,
>
> I mentioned setting To: author instead of From: author-like, near the bottom 
> of a message[*] a week ago, but missed any WG comments on it. That setting 
> would result if I run a mailing list "by hand", using a normal email client. 
> I'd hit reply and then add a bunch of Bcc:'s. Of course, a suitable template 
> would insert a subject tag instead of "Re:", et cetera.
>
> It'd be a cleaner solution than From: rewriting, inasmuch as it saves the 
> association between display names and addresses, for the sake of address 
> books consistency. The anomaly of seeing authors in To: fields, with some 
> getting used to it, may even become a distinguished characteristic of 
> indirect mail flows.
>
> How unbearable would that be? And why? Maybe some comments on this subject 
> can bring out some more details about the rightness or wrongness of the 
> various flavors of From: rewriting.

If nothing else changes; as in: MLMs have to keep promoting the use of From 
munging to their list operators, then I think it would be useful for these MLM 
to also offer (and perhaps default-to-ON if it works well in practice) your 
idea of replacing the To with the author during the munging process.

It would increase the odds that the author will be added to the recipient's 
address book, either manually, or via auto-collection by MUAs when they 
Reply-all (I believe that most MUAs will include the To in the recipient list 
if it differs from the user's own address)

Recipients (and individual list operators) may still complain about the From 
munging, but I like your line of reasoning of getting people used to 
"distinguished characteristic of indirect mail flows".

Recipients will still be saddled with "author via listname" polluting their 
address books (via address auto-collection). This idea doesn't solve that 
problem.

Jesse

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