Hi List Admins,
On Aug 1st mailman will be configured to improve message delivery from users
whose email provider has a strict DMARC policy (yahoo, aol, etc.). Here’s a
quick breakdown of what will change:
Messages whose original From: domain publishes a DMARC policy of p=reject or
p=quarantine will...
Have the From: header rewritten (Munged) to the posters name 'via the list'
<list_address> and
Merge the poster's address into the Reply-To: header
To reiterate, only if the senders email domain has a strict DMARC policy will
the from address be rewritten. While rewriting the from header may not be
ideal this is a necessary setting to ensure reliability of the mailing list
system. Without rewriting these messages may be lost silently, or with cryptic
error DSN messages returned to the poster. List admins may optionally choose a
different moderation action on a per-list basis.
Additional detail about mailman configuration and DMARC moderation settings be
found at https://wikitech.wikimedia.org/wiki/Mailman#DMARC_Compatibility
<https://wikitech.wikimedia.org/wiki/Mailman#DMARC_Compatibility>
Best,
—Keith
Keith Herron | Ops Engineer
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