[Mailman-Users] dangers of using subject_prefix with new DMARC problems

Matthew Taylor matt at numenta.org
Tue Sep 9 18:47:59 CEST 2014

Hello all,

I'm a Mailman administrator for the lists at http://numenta.org/lists.
Recently, we had DMARC problems with Google servers, and my provider
(EMWD) gave me the following actions to take:


We ended up moving the lists to a VPS with the new settings.

Many of our users are upset that I've removed the subject_prefix from
the list emails, but I'm afraid that putting them back in might cause
the same problems, given the advice from EMWD in the link above:

"2.  Turn off Content filtering, and Reply-To: header munging and
remove subject_prefix, msg_header and msg_footer so Mailman doesn't
make message modifications that break Yahoo's DKIM signature."

Is it safe to add back the subject_prefix to my lists?

Thank you,
Matt Taylor
OS Community Flag-Bearer

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