For example, "munge from" is applied only to messages from domains that publish a DMARC policy of 'reject' or 'quarantine'. However, if the message mailman is sending has a valid DKIM signature because there is no footer or subject prefix and no other edge cases, there is no reason to munge, because it will pass the DMARC check. It seems Mailman could do that. Or, if not, could it seems the MTA could do this checking and munging.
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