[LRUG] [META] List “who these emails are from" settings change

[Murray Steele]

Hi folks,

As list moderators we’re starting to see an uptick in bounced messages
because of DMARC settings.

What this means is if someone posts to the list from a domain with DMARC of
“reject” then when that message is received by a DMARC compliant server it
will be bounced back to the list.  This increments the bounce count for the
_receiver_ of the message, and eventually, on a high traffic enough list
they will be quietly unsubscribed.  They aren’t getting some messages and
then they don’t get _any_ message.

We’ve tried a setting that is supposed to understand if the message is
coming from a strict DMARC domain and massage the “from” headers so it no
longer looks like it’s come from that domain.  It doesn’t seem to be doing
anything though, so we’re changing the list to do this to _every_ mail.

What this means is it’ll be _slightly_ harder to reply directly to people
instead of the list, but more emails to the list should actually make it to
everyone’s inboxes.  Not really sure what it’ll look like yet, but I guess
I will once this email is sent.  Should mean everyone gets all the messages
though and only real “can’t send this message to this inbox” bounces (e.g.
email address isn’t valid) will cause eventual unsubscription.

If we can work out why the “only for emails from strict DMARC domains”
setting isn’t working, we might change this back.  But for now, just take
care when replying especially if you wanted to reply to the sender, not the
list.  There’s no setting for a mailing list that means you don’t need to
do this, unfortunately.

Cheers,

Murray
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