Quoting Russell Coker (russell@coker.com.au):
List servers ARE changing the sender. Instead of receiving a message directly from the person you receive mail from the list server which has very different issues with anti-spam etc.
{sigh} Um, I'll be charitable and assume you really didn't follow what I said. Here are the main SMTP + envelope headers from a post I sent yesterday to the main Silicon Valley Linux User Group discussion mailing list, as originally sent: From rick@linuxmafia.com Mon Nov 16 17: 2:17 2015 Date: Mon, 16 Nov 2015 17:22:17 -0800 From: Rick Moen <rick@linuxmafia.com> To: svlug@lists.svlug.org Subject: Re: [svlug] procmail (was: Some pretty serious parsing) Here, for comparison, is the retransmitted set of SMTP + envelope headers upon retransmission by SVLUG's Mailman instance and MTA: From svlug-bounces+rick=linuxmafia.com@lists.svlug.org Mon Nov 16 17: 2:51 2015 Date: Mon, 16 Nov 2015 17:22:17 -0800 From: Rick Moen <rick@linuxmafia.com> To: svlug@lists.svlug.org Subject: Re: [svlug] procmail (was: Some pretty serious parsing) Readers will please note that Mailman encodes the relaying information into the envelope 'From ' header but leaves all of my original SMTP headers alone. That is the way MLMs function all over the planet, and nobody in my experience is having DKIM or DMARC-related deliverability problems at this time. If it were otherwise, I would know, on account of being listadmin in a number of places where we'd be in trouble. I'm reasonably certain that the SVLUG, BALUG, and CABAL mailing list's, among many others I'm on, have significant numbers of Yahoo Mail users (even though Yahoo Mail has become really terrible), and we simply are not hearing of, or seeing deliverability problems. [...]
I don't believe that it is in any way falsified.
I am having a very difficult time believing you do not comprehend _exactly_ what Craig, I, and many others are saying. You would appear to be pretending to not understand, as surely we have all been abundantly clear and lucid. Now, I respect your right to make technical decisions you feel are right with LUV's mailing lists. I've described the damage that the current course of action is, in my view, doing. Please don't try to tell me I'm not seeing what I'm in fact seeing. Rather, if you wish to go ahead and do what you want, good luck to you. I'm going to leave it at that. [rest snipped]