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SPF Record Testing Tools - Kitterman SPF: Project Overview - Sender Policy Framework (SPF) TXT record - Wikipedia IANA — Protocol Registries Java Tester - Other Testers Sender Policy Framework - Wikipedia SPF: Best Practices - RFC INDEX - RFC Editor 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 Publishing SPF. Combine a strict policy with authenticated SMTP; Integrate your SPF deployment with DKIM and DMARC; Use Feedback methods from SPF and other 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 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. Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain. Sender Policy Framework (SPF) is a simple email-validation system designed to detect email spoofing by providing a mechanism to allow receiving mail This file contains citations for all RFCs in reverse numeric order. RFC citations appear in this format: