SPF, short for Sender Policy Framework, is one of the many ways to fight spam. It’s based on verifying insecure data (mail) with secure data (dns). SPF is a check that is performed on the receiving mailserver. SPF fights the type of spam that sends via open (or hacked) mailservers which use forged sender addresses. Although many servers have it activated for the insecure incoming mail, many people configure the secure part in the DNS wrong.

Let’s look at SPF closely. Meet Mr Spammer, who operates from Russia and has a business in medical equipment. Also meet Bob, a system administrator who is responsible for the mail environment of SomeCompany. One day you will receive an e-mail in your mailbox that has the following headers: Why SPF helps fighting spam - The Inside

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