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Google Apps Domain Create SPF Records For BIND or Djbdns

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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UNIX / Linux: Explains setuid File Permission

What does it mean for a file to be "setuid?" How do keep track of all setuid enabled file?
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FreeBSD ERROR: (8011-323-1057) Failed to allocate memory and Solution

Q. I'm running application called Urchin or Google Analytics under FreeBSD and I'm getting the error that read as follows:
ERROR: (8011-323-1057) Failed to allocate memory

How do I fix this error?
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