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In order to run this port, write your dkim-filter.conf and add the
milter socket `socketspec' in /etc/mail/<your_configuration>.mc:

INPUT_MAIL_FILTER(`dkim-filter', `S=_YOUR_SOCKET_SPEC_, F=T, T=R:2m')

And to run the milter from startup, add milterdkim_enable="YES" in
your /etc/rc.conf.
Extra options can be found in startup script.

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