How-to: Configure and use Sender Policy Framework

We had a curious phenomena until recently in which email generated by the client's newly launched website was being rejected as spam by some members of its partner network. After a diagnosis of the mail formatting, the suggestion was that SPF needed to be configured. You may realise that SPF is not a quality measure for sunscreen... SPF stands for Sender Policy Framework . It is an email validation system designed to prevent email spam by detecting email spoofing, a common vulnerability, by verifying sender IP addresses. SPF allows administrators to specify which hosts are allowed to send mail under a given domain by creating a specific SPF record. So far, so technical...