mailing list changes

[tormento]

When I reply from Gmail I always have to change the address or the mail
will be apparently sent to the person, not to the mailing list.

Il giorno sab 7 mar 2020 alle 14:31 Jef Driesen via subsurface <
subsurface at subsurface-divelog.org> ha scritto:

> On 7/03/2020 13:50, Christof Arnosti via subsurface wrote:
> > Can you explain this a bit more?
> >
> > I think that DKIM / DMARC does exactly what it should: preventing
> modification
> > of mails with "MailFrom" from my domain on-the-fly.
> >
> > I also have SPF configured, which should in theory also lead to a reject
> when my
> > domain is used as MailFrom.
> >
> > With DMARC, if I understand correctly, the mail should only be threated
> as
> > boguous when both of these mechanisms fail at once. This is the case
> when the
> > subsurface-divelog.org list server modifies my mail (breaks DKIM) and
> sends it
> > from it own server (breaks SPF) with MailFrom ~= *@charno.ch.
> >
> > I understand that this leads to problems with mailing lists, but on the
> other
> > hand I would think that replacing the sender address by the mailing list
> > software (like done now on subsurface-divelog.org) should be the right
> way to
> > deal with this problem. Honestly, I'm more curious about why your mail
> client
> > only displays the sender mail-address (but not always? The mail you
> directly
> > received from Benjamin seems fine?) instead of the name in the
> MailFrom-Header.
> >
> > I think that DMARC / DKIM / SPF are a quite important tool in the fight
> against
> > mail spoofing, so I would hate to weaken or disable it.
> >
> > Can you give me some recommendation on how I should configure DMARC /
> DKIM / SPF
> > without breaking spoof-save mailing, but still working with mailinglists
> > configured like subsurface was before?
> There is an import difference between the "From" email header (which is
> displayed by the mail client), and the sender/recipient address ("mail
> from" and
> "rcpt to") used during the smtp communication. For SPF only the latter is
> relevant. So it would be perfectly possible to leave the From header
> intact:
>
>     From: Christof Arnosti <... at charno.ch>
>
> and send the mail from the subsurface domain:
>
>     MAIL FROM: <subsurface at subsurface-divelog.org>
>     RCPT TO: <user at domain.tld>
>
> For SPF everything should be fine because the mail originates from the
> subsurface mail server, and the mail client will show the correct name. Or
> am I
> missing something? I'm certainly not an expert on mail server
> configuration, but
> I do run one too.
>
> For DKIM/DMARC I don't really know.
>
> Jef
> _______________________________________________
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> subsurface at subsurface-divelog.org
> http://lists.subsurface-divelog.org/cgi-bin/mailman/listinfo/subsurface
>
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