[RCU] This appears to be the problem I am getting with this list - and now other lists - DMARC / DKIM / SPF

James Wang yuwang at cs.fsu.edu
Tue Aug 4 18:37:56 CEST 2020

RCU's mailman admin can change this setting to fix it:

Under "General Options",

Replace the From: header address with the list's posting address to 
mitigate issues stemming from the original From: domain's DMARC or 
similar policies.
(Details for from_is_list)

"No" 	"Munge From" 	"Wrap Message"

The default is "No". Change it to "Munge From".

Then one's post to RCU list would have from address of roundcube.net 
instead of poster's address.

For instance, current posts from Philip Rhoades has:

users-bounces at lists.roundcube.net; on behalf of; Philip Rhoades 
<phil at pricom.com.au>

After changing to 'Munge From', it would become:

users-bounces at lists.roundcube.net; on behalf of; Philip Rhoades via 
users <users at lists.roundcube.net>

Mail servers examine DMARC record would accept the posts.

Mailman 2.1.14 should have 'Munge From' feature, if not, then 2.1.20 
definitely has it (we currently use Mailman 2.1.20 in our place).

James Wang
CS Systems

On 2020-08-04 01:52, Philip Rhoades wrote:
> People,
> FYI, this seems to explain (most of) my hassles mailing to this list:
>   Yahoo breaks every mailing list in the world including the IETF's
> https://mailarchive.ietf.org/arch/msg/ietf/J-IsfA0Lb-6T_NeMD1ENKZyb9tA/
> Phil.

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