Sender Policy Framework (SPF) is an e-mail authentication framework designed to detect and block fake or spoofed emails. SPF has become increasingly important in helping to validate that networks should send emails on behalf of your domain which directly affects the distribution. It helps Internet Service Providers to confirm that a mail server (IP address) is allowed to send emails to a given domain. It is done by verifying the sender’s email server before delivering all legitimate email to a recipient’s inbox. The domain administrator shall draw up a list of servers or IP addresses that are allowed to send emails on behalf of the domain. If a malicious user tries to send emails to the “receiving” network for distribution, the email server ensures that the recipient is on the domain list of approved senders. SPF allows only legitimate emails to the receiver’s address which eliminates the chance of spam, virus, and phishing scheme emails.


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