On 1/4/26 13:02, Brie Yoder via Mailman-Users wrote:
[Using MM 2.1.39 hosted at dreamhost.com]
Starting Dec 27, the Mailman list I admin started getting bounces to Gmail
accounts, but only for digest messages - the individual messages have been
going through without (apparent) problem. Sample bounce error:
Dealing with gmail has become a nightmare. For example, even though
gmail publishes a DMARC policy of `none`, they require mail From: the
gmail.com domain to pass DMARC. You can apply DMARC mitigations to mail
From: gmail.com addresses by putting
^.*@gmail\.com$
Privacy options...->Sender filters->dmarc_moderation_addresses
but this doesn't affect digests which are From: the list and should pass
DMARC as long as they are DKIM signed by the list domain and pass SPF.
Looking in a digest email header, there are no DKIM-Signature: headers, but
there are ARC-Seal: and ARC-Message-Signature: headers. (Is this expected or is
this a bug?)
The ARC-* headers are probably added by some downstream MTA and not by
the list server. It makes no sense that the list server would be adding
ARC-* headers and not DKIM signing the mail.
Digest mail should definitely be DKIM signed by the list host. This is a
Dreamhost (nightmarehost?) issue. They need to to configure their
servers to DKIM sign all outgoing list mail from the list domain. This
is something Dreamhost needs to do. It is not something over which you
have any control.
--
Mark Sapiro <[email protected]> The highway is for gamblers,
San Francisco Bay Area, California better use your sense - B. Dylan
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