On Sat, 01 Aug 2015 06:47:48 -0700, Peter N. M. Hansteen <pe...@bsdly.net> wrote:
Either that or use the nospamd feature (see man 8 spamd and the rules
example) and fill up the table from a useful source. I've accumulated
some in my nospamd file which I make available at
http://www.bsdly.net/~peter/nospamd, based on various episodes and
some digging out of spf records (dig -ttxt domain.tld).

There's also a github project called spf2cidr [1] that use SPF records to create an IP whitelist for all your favorite PRISM compliant email providers.

[1] https://github.com/toddfries/spf2cidr

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