In which DNS zone files i have to put spf record entry to get "spf=pass"?

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http://serverfault.com – "Authentication-Results: mx.google.com; spf=neutral (google.com: is neither permitted nor denied by best guess record for domain of vns6.wtech.in) smtp.mail=[email protected]". This is the result when I get after seeing the mail sent from my mail server to gmail so I want to turn spf=neutral to spf=pass Can anybody tell me how to do this? Also I want to know in which zone file of dns I have to put my spf record entry? (HowTos)