On Sat 13/Jun/2020 07:19:21 +0200 Hector Santos wrote:
On 6/12/2020 4:02 AM, Alessandro Vesely wrote:
*From rewriting is the real thing*
==================================
Rewriting From: is the de-facto standard.
I don't support it.
In a (science-fictitious) scenario where all mailing lists
rewrite the From: header field, DMARC would just work
smoothly.
Occam's razor. The simplest and most honorable protocol solution is to follow
the specs. DMARC will work just fine without tampering with headers if the
list server simply honored the restrictive policy. It works greats!!
A DKIM Policy compliant list server simply needs to do two things:
1) Prohibit new subscribers using addresses with restrictive domains, just like
it is done here:
https://secure.winserver.com/public/code/html-subscribe?list=winserver
2) Prohibit submission from existing subscribers using addresses with
restrictive domains. The existing subscriber becomes a read-only subscriber.
Restricting mailing list usage to domains with no DMARC policy is a hindrance
to DMARC effectiveness. Those mailing list cannot filter out unauthenticated
spammers.
Hence, we have to specify an acceptable way to rewrite From:.
This is no acceptable way to tamper the mail in this way. But I did suggest
with following. For an example of what it did to my headers:
X-Original-From: Hector Santos <hsan...@isdg.net>
From: Hector Santos <hsantos=40isdg....@dmarc.ietf.org>
Why is that unacceptable?
After all, the message comes from dmarc.ietf.org. They are responsible for
filtering. The message comes from them. You just authored it —compare with
digest mode.
I like to see the author's name displayed in the folder view. However,
choosing how to rewrite should be an author's decision.
For another effect, if the list broadcasted messages maintaining the original
From:, then isdg.net would receive an explosion of rows in the aggregate
report, loosing the ability to match it with the mail they actually sent.
Best
Ale
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