This is the Trusted Domain Project's impementation of the DMARC protocol libary and mail filter, called OpenDMARC. A "milter" connects to unix-based mailers (originally, sendmail, but now many) and provides a standard filtering API.
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Allow override list of domains that will result in milter rejection #227
Many commonly-spoofed domains like gmail.com and yandex.com post p=none DMARC policies.
It would be nice to override their cautious desire, and to apply a reject policy on spoofed mail from these domains.
ForceRejectForDomains=gmail.com,yandex.com