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csc-milter/README.md

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Spoof Milter

Postfix does not provide libmilter so you will need to install that

apt install libmilter

may be provided by sendmail-devel on some systems

You will also need to install pymilter

pip install pymilter

Installation

in /etc/postfix/mail.cf

smtpd_milters = inet:localhost:<portnumber> ...other filters...

Write systemd thing to run milter

/some/where/opendkim -l -u userid -p inet:<portnumber>@localhost ...other options...

Other notes

Different milter settings for different client IP addresses

/etc/postfix/main.cf:
    smtpd_milter_maps = cidr:/etc/postfix/smtpd_milter_map
    smtpd_milters = inet:host:port, { inet:host:port, ... }, ...

/etc/postfix/smtpd_milter_map:
    # Disable Milters for local clients.
    # do this for local waterloo 
    127.0.0.0/8    DISABLE
    192.168.0.0/16 DISABLE
    ::/64          DISABLE
    2001:db8::/32  DISABLE