Hi Anthony,
LISTSERV is not as tweak-able as you would think in this regard. It has
some code which seems to look into the DMARC policy for each sender, and
if your sending domain specifies p=reject or p=quarantine in its DMARC
policy, then it will automatically re-write your sender address when
distributing a list message so it does not collide with the DMARC policy.
If you're curious, the docs are here:
https://lsoft.com/manuals/17.0/advancedtopics/133HowdoesLISTSERVcomplywithDMAR.html
You can see this happening with:
Anthony Carrico <[email protected]>
Marcantonio Rendino <[email protected]>
Because icloud.com and memebeam.org both publish p=reject DMARC policies.
It is not happening with (e.g.)
Paul Flint <[email protected]>
Stephen Barner <[email protected]>
Kevin Cole <[email protected]>
Because FLINT.COM and GMAIL.COM publish a p=none policy. In itself this
is not a problem...
While I don't have the log data in front of me to prove it, it appears
that some major providers, in particular, icloud.com, still behave as
though gmail.com has a p=reject policy, even though gmail.com publishes
a p=none policy in DNS. I'm sure this is done in the name of reducing
mail forgeries, spam, and joe-jobs, and a better experience for
icloud.com users. Unfortunately, it's a real impedance mismatch with
LISTSERV. There doesn't seem to be a way to tell LISTSERV to rewrite the
sender anyway, and I personally don't have the time while I'm at work to
chase this issue as mail administration now only represents the tiniest
portion of my job responsibilities. The only reason I'm writing this
now is because I'm putting off shoveling my driveway...
Jim (old UVM admin and VAGUE member)
On 2/7/26 12:02, Anthony Carrico wrote:
Hopefully the UVM admins are becoming aware of the issue and can tweak
the setting to the mailing list software. I think such software has
converged on some rewriting that works to satisfy the dmarc/dkim/spf
infrastructure.
It is a shame, we were heading down the path for people to sign their
mail back in the '90s, but Senator McCain and Bill Gates didn't
like/understand signature and derailed it. Now we seem to be stuck
with outsourcing our own signatures to the post office. The world is
upside down.
