Bitfox via Postfix-users:
> Hello
> 
> I saw that when messages sent to duck.com for forwarding, duck.com will 
> remove the original DKIM info from headers, to protect the sender 
> privacy.
> 
> I am just curious how to remove that DKIM in postfix?

With the header_checks IGNORE or STRIP action.
https://www.postfix.org/header_checks.5.html#actions

        Wietse
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