spf issue postfix

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http://serverfault.com – Received-SPF: none (domain of deens1.chickenkiller.com does not designate permitted sender hosts) Received-SPF: pass (google.com: best guess record for domain of [email protected] designates as permitted sender) client-ip=; these are mail headers when i send email from my domain.I want to know why gmail is showing spf="pass" and why yahoo is showing it "none". (HowTos)