Actually, small receivers can simply trust selected, DMARC-aligned mailing
lists and restore the original From: in the cases where MLM saved it (w/o
ARC). This kind of hack could be set up really quick. >
Please please can we stop doing this. Trying to unmunge rewritten From:
headers is totally out of scope for this group, and even if it weren't it
does not scale
Symptomatic treatment is out of scope?
Telling people to screw up their lists to avoid damage we caused is
blaming the victim. To make an overwrought analogy, it's like the
politicians in the US telling schools to add reinforced steel doors to
keep out crazy people with guns.
Why doesn't it scale?
Because there are more ways for a forwarder to change a message than you
or I can describe.
Isn't that exactly the same problem that ARC poses?
It's similar, but the difference is that ARC actually deals with the
problem and this doesn't. ARC answers the question the recipients care
about, "was this message aligned before it was forwarded?" Your approach
doesn't, and can't if the original message was aligned using SPF.
Regards,
John Levine, jo...@taugh.com, Taughannock Networks, Trumansburg NY
Please consider the environment before reading this e-mail. https://jl.ly
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