> This list uses Mailman configuration settings, not handcrafted code.
> If people believe that it is worthwhile to change the Mailman
> implementation or the DMARC spec, then I suggest that they work
> with the people responsible for that.

There is no need for changing implementations, it's already there.

https://docs.mailman3.org/projects/mailman/en/latest/src/mailman/config/docs/config.html

############################
remove_dkim_headers

default: no

Some list posts and mail to the -owner address may contain DomainKey or 
DomainKeys Identified Mail (DKIM) signature headers <http://www.dkim.org/>. 
Various list transformations to the message such as adding a list header or 
footer or scrubbing attachments or even reply-to munging can break these 
signatures. It is generally felt that these signatures have value, even if 
broken and even if the outgoing message is resigned. However, some sites may 
wish to remove these headers by setting this to ‘yes’.
############################

I do not request any changes to this list, just wanted to mention other options.

Best regards,
Gerald
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