On Fri, Jul 01, 2016 at 08:16:10 -0500, Chris Adams <linux@xxxxxxxxxxx> wrote:
The correct solution is for the mailing list software to be changed to rewrite From: addresses. Newer versions of Mailman support this. The address rewriting is annoying, but is the only true solution to being in between sites that publish and honor DMARC policies.
I disagree. The correct solution is to detect that this is a list message and evaluate it some other way. For example the envelope sender address could be checked instead of the from address. Some signature systems will pass through mailing lists and still be verifiable.
Modying from headers is going to cause problems with replies and it really doesn't do anything but flag the message was resent, whivh can be figured out with better methods.
This does solve the spam problem in any case as plenty of spam gets sent from places like yahoo and gmail because end users get their credentials stolen by spammers a lot.
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