Austin Witmer via Postfix-users:
> > You will need SPF, DKIM, and DMARC with 'p=reject'. If this is
> > an interactive list, you will need to replace list member's From:
> > headers with your mailing list address to satisfy DMARC.
>
> I believe I have SPF, DKIM and DMARC setup with p=reject.
>
> So the big list with 1500 members is not an interactive list and
> probably will just have one sending (gmail) address.
Your server is not gmail.com, so when you send BULK mail with a
From: addr...@gmail.com from a non-gmailk server, then that can
be problematic.
> Will DMARC be broken if I only add the following headers to mailing
> list messages?
>
> X-Mailinglist:
> List-Id:
> List-Unsubscribe:
> List-Unsubscribe-Post:
Unlikely. Note that the rules for BULK mail are defined by the
receiver.
> From what I was reading online, I thought "From munging" is not
> necessary if I am not modifying the subject, body or existing email
> headers. And thus the original senders DMARC won't be broken,
> right?
That may still work with low-volume PERSONAL mail, but the rules with
BULK mail are different.
Wietse
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