accept email if pass SPF or DKIM

[li...@lazygranch.com]

RTFMing, I see that both opendkim and python-policyd-spf have
whitelisting capabilities (especially python-policyd-spf). But for the
most part, my legitimate incoming email passes DKIM or SPF, but often
not both. What I would like to do is accept email that passes either
DKIM or SPF, but the milters are not connected in anyway that I can
see. What I'm trying to avoid is setting up whitelists for each domain
based on which method of identity the sysop decided to implement.