[courier-users] courier-mta and bofh rules

[-=Devil_InSide=- <dev...@ma...>]

where can i can know, what means a list of result from spf checking "none,pass,neutral,error ..." etc. ? 
i write a letter from a dev...@ma... , message goes from the mx38.mail.ru and result of spf : none.
-log-
Feb 10 02:23:38 kms courieresmtpd: error,relay=::ffff:194.67.23.16,from=<dev...@ma...>: 417 SPF none mx38.mail.ru: Address does not pass the Sender Policy Framework
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but spam from bla@bla.bla.ue  goes from 7778.dsl.999.blublublu.pl  has spf result identical: none.
-log-
Feb 10 01:25:54 kms courieresmtpd: error,relay=::ffff:60.48.46.43,from=<ste...@ba...>: 417 SPF none 43.46.48.60.jb04-home.tm.net.my: Address does not pass the Sender Policy Framework
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what kind of result is permitted normally? 
why not work option "freemail mail.ru mail.ru" and "freemail land.ru pochta.ru" === messages from this servers has spf "none" and not recieving?

how i can adjust personal rules for any servers ? 

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