djbdns spf

I work for a small business and outsourced our email hosting to Google. However, I noticed that spammers are using our From: First Last to send their spam messages. All bounced messages come to our catch only account. How do I stop this? How do I validate our domain using SPF? How do I configure a SPF for Google Apps domain using BIND 9 or djbdns?

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Q. How do I configure Sender Policy Framework (SPF) anti spam forgery system under Redhat Linux BIND server? I was advised to configure SPF for our corporate domain to identify and reject forged addresses in the SMTP MAIL FROM (Return-Path), a typical nuisance in e-mail spam.

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