[alsa-devel] DMARC & gmail & cirrus.com

[Lars-Peter Clausen]

On 2/17/20 9:46 AM, Jaroslav Kysela wrote:
> Hi all,
>
>     today, all gmail users were unsubscribed from the mailing list, 
> because we have users who sends e-mails from domains with the DMARC 
> policy reject (like cirrus.com). The mailman counts those bounces and 
> unsubscribe users who do not receive those e-mails. The nice 
> explanation is here:
>
> https://www.linuxchix.org/content/mailing-list-changes
>
>     I can enable the "Replace the From: header address" in the mailman 
> config to "Munge From" like in the above example, but it will mean 
> that From: will be altered (see the explanation).
>
>     Another option is to disable the bounce check in mailman, but it 
> will cause that the "dead" subscribers are not detected anymore.
>
>     Any opinions on this?
>
>                     Jaroslav 

The way I understand it option 2 would also mean that nobody at a 
service provider that implements DMARC checks on the receiver side would 
receive mail sent to the list by people using a service provider that 
has a reject policy for outgoing mails. E.g. in your example while gmail 
users would not be unsubscribed from the mailing-list, but they still 
wouldn't receive the mails sent from cirrus.com. Which kind of makes the 
mailinglist useless.

The way I understand the option to replace the From: header is that it 
will only happen for those that have a reject policy, for everybody else 
nothing changes. So if the mailinglist is supposed to stay useful for 
those with a reject policy the only option is to rewrite the from header 
for them.

- Lars