DKIM and SPF fail for messages sent via mutt-users

[Charles Cazabon]

Jan Eden <tech at eden.one> wrote:
> 
> I recently sent a message to this list, and received a couple of DMARC
> reports from various mail providers to my postmaster address:
[...]
> 
> I was under the impression that earlier issues with DMARC, DKIM and SPF with
> respect to mailing lists were solvable

Others have addressed DKIM, but for SPF I have found that every message to a
mailing list of any size generates a number of reports of SPF failures, even
though the list has correctly used its own domain in the envelope return path.

I believe this is because there are people or bots subscribed to the list
using terrible mail-forwarding configurations, where the forwarded message is
sent with an envelope sender extracted from the From: header field - either
because the software is a disaster, or because it's being used on a machine
that cannot or does not properly record the original envelope when delivering
received messages.

Charles
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Charles Cazabon
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