Mail delivery of macports-changes disabled for Gmail users

[Ryan Schmidt]

This happened again yesterday.


> On Feb 25, 2019, at 13:53, Rainer Müller wrote:
> 
> Hello,
> 
> if you are using Gmail or a Google hosted mail service for your domain,
> your subscription to the macports-changes mailing list was likely
> disabled on 2019-02-22 by mailman due to "excessive or fatal bounces".
> 
> If you still want to receive the mailing list, but are currently not
> getting the emails, you have to take manual action. Please follow the
> link below to the mailman options. After logging in, check that the
> option "Mail delivery" is Enabled for your account.
> 
> https://lists.macports.org/mailman/options/macports-changes
> 
> 
> The technical cause of this was an email being rejected by Google due to
> a strict DMARC policy for the From address. The way Google handled this
> was correct as this mail was in fact not originating from a source
> whitelisted by the domain owner of the From address.
> 
> Although we configured all our lists on mailman exactly for this reason
> with dmarc_moderation_action="Munge From" [1], we now discovered that
> this setting is an action that only applies to mails going through the
> moderation queue. However, as posting to macports-changes is meant to be
> restricted, legitimate mails are pre-approved. As we have learned now,
> skipping the moderation unfortunately also skips the DMARC munging that
> was supposed to prevent such bounces.
> 
> In order to prevent this from happening again, I would like to no longer
> sent mails with the author's address as From, but use a generic From
> address and merely the author to CC. Unless someone else comes up with a
> better idea, I will look into applying this in the next days.
> 
> Rainer
> 
> [1] https://www.gnu.org/software/mailman/mailman-admin/sender-filters.html