Noting.... you do part of this already. But..... note this nasty effect:
--- From: Jonas Meier via swinog <swinog@lists.swinog.ch> Reply-To: Jonas Meier <me...@init7.net> --- Now add that to people having "automatically add recipient to addressbook" and when one wants to send an email to Jonas... it autocompletes to the public list ;) Mailman3 does not do the @via trick yet unfortunately; hence why folks use custom remailers quite often :) Greets, Jeroen > On 8 Jun 2023, at 12:06, Jeroen Massar <jer...@massar.ch> wrote: > > > >> On 8 Jun 2023, at 11:47, Jonas Meier via swinog <swinog@lists.swinog.ch> >> wrote: >> >> Hi Franco, Dear List >> >> Thank you for your feedback. >> >> 1) I configured mailman3 [1] dmarc_mitigate_action to "munge_from" (to >> replace the from header) and dmarc_mitigate_unconditionally to true. My >> thought was that this would mean that there can no longer be a dmarc policy >> which sets dkim to strict. This way, an invalid dkim signature would no >> longer be such a big problem. But I was probably wrong. I don't want to set >> up the mails to be re-signed overnight, maybe there is an option to remove >> the signature. If anyone has experience with mailman3 and dkim, please write >> to me directly. > > The only real solution is effectively to do SRS aka "From Rewriting" to be > able to decently send emails through a mailinglist and have them not land up > in spam/junk... > > The list has to remove the Original "From" and replace it with eg > jeroen+massar.ch@via.lists.swinog > <mailto:jeroen+massar.ch@via.lists.swinog>.ch > Then you sign that From with your DKIM key. > > To make the receiver happy that there is the 'old' DKIM header you then need > to do ARC signingt: http://arc-spec.org/ > That way, a receiver knows "oh the rewrote something and they are taking > responsibility for this mail" > > > > For Mailman there is some info here: https://wiki.list.org/DEV/DMARC > > Thus the option you need to do is: > > "Munge the From: header" > some other details: > https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/handlers/docs/dmarc-mitigations.html > > For ARC: > https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/handlers/docs/arc_sign.html > > Greets, > Jeroen > > _______________________________________________ swinog mailing list -- swinog@lists.swinog.ch To unsubscribe send an email to swinog-le...@lists.swinog.ch
