[Mailman-Users] cause of bounces
gtaylor at tnetconsulting.net
Tue Oct 17 13:38:48 EDT 2017
On 10/17/2017 10:55 AM, Christian F Buser via Mailman-Users wrote:
> I can perfectly follow your thoughts and arguments, they appear to be
> justified and reasonable.
Thank you. I tried to make them so that people could understand, even
if they choose to disagree.
> However, could you please elaborate whether Mailman (version 2.x or
> 3.x) or any other mailing list software really follows your ideas?
Yes!!! Mailman (and other MLMs) /can/ be configured to be SPF / DKIM /
> If it is just a question of the setup for the mailing list, I would
> expect your instructions on how to set it up properly.
I don't have the exact step by step details. - I'm sure others
(Mark...) on this list can give specifics on /how/ to configure Mailman.
The high level as I understand it is to do the following:
1) Set dmarc_moderation_action to munge From header.
2) Set REMOVE_DKIM_HEADERS to Yes (1) or 2 or 3.
3) Send messages from the list address. I recommend VERP.
Doing those three things ensures that messages leaving the mailing list
do not violate the original sending domain's SPF / DKIM / DMARC security
I would suggest that you also consider adding SPF / DKIM / DMARC for the
domain of the mailing list to apply similar protections to outgoing
messages. However that is not necessary to avoid undesired bounces.
> Thank you, Christian
Grant. . . .
unix || die
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