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Java Tester - Other Testers SPF: Best Practices - TXT record - Wikipedia Sender Policy Framework - Wikipedia RFC INDEX - RFC Editor SPF: Project Overview - Sender Policy Framework (SPF) IANA — Protocol Registries SPF Record Testing Tools - Kitterman Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain. This file contains citations for all RFCs in reverse numeric order. RFC citations appear in this format: See my Defensive Computing blog at Other Testers No web site on the Internet is particularly unique. Below is a list of other tester Protocol Registries. We are responsible for maintaining many of the codes and numbers contained in a variety of Internet protocols, enumerated below. NOTE: The domain is everything to the right of the '@' in the e-mail address. Is this SPF record valid - syntactically correct? Tests the supplied SPF A TXT record (short for text record) is a type of resource record in the Domain Name System (DNS) used to provide the ability to associate some arbitrary Publishing SPF. Combine a strict policy with authenticated SMTP; Integrate your SPF deployment with DKIM and DMARC; Use Feedback methods from SPF and other