<ul><li>SPF is an email authentication protocol designed to combat email address forgery and spoofing by allowing administrators to specify which hosts can send emails from a domain.</li><li>SPF record types use TXT records to specify authorized sending hosts, and example SPF record includes declaration of version, authorized IPs, and handling of non-listed senders.</li><li>Receiving mail servers verify SPF by checking the domain's SPF policy, parsing SPF mechanisms, and evaluating the sender's IP address based on these mechanisms to accept or reject the email.</li><li>While SPF is a fundamental way to combat impersonation, it is recommended to use SPF in conjunction with DKIM and DMARC for enhanced email security and to regularly monitor and update SPF records for a robust email ecosystem.</li></ul>

The Sender Policy Framework: Bare Bone Essentials

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