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2. Sender Policy Framework - Wikipedia

   en.wikipedia.org/wiki/Sender_Policy_Framework

   For a while a new record type (SPF, type 99) was registered and made available in common DNS software. Use of TXT records for SPF was intended as a transitional mechanism at the time. The experimental RFC, RFC 4408, section 3.1.1, suggested "an SPF-compliant domain name SHOULD have SPF records of both RR types". [ 14 ]

3. List of DNS record types - Wikipedia

   en.wikipedia.org/wiki/List_of_DNS_record_types

   Specified as part of the Sender Policy Framework protocol as an alternative to storing SPF data in TXT records, using the same format. It was discontinued in RFC 7208 due to widespread lack of support. [19] [20] NINFO 56 — Used to provide status information about a zone. Requested for the IETF draft "The Zone Status (ZS) DNS Resource Record ...

4. DomainKeys Identified Mail - Wikipedia

   en.wikipedia.org/wiki/DomainKeys_Identified_Mail

   A CNAME record can also be used to point at a different TXT record, for example when one organization sends email on behalf of another. The receiver can use the public key (value of the p tag) to then validate the signature on the hash value in the header field, and check it against the hash value for the mail message (headers and body) that ...

5. Sender ID - Wikipedia

   en.wikipedia.org/wiki/Sender_ID

   Sender ID is an historic [1] anti-spoofing proposal from the former MARID IETF working group that tried to join Sender Policy Framework (SPF) and Caller ID. Sender ID is defined primarily in Experimental RFC 4406, [2] but there are additional parts in RFC 4405, [3] RFC 4407 [4] and RFC 4408.

6. Email authentication - Wikipedia

   en.wikipedia.org/wiki/Email_authentication

   The SPF verifier queries the Domain Name System (DNS) for a matching SPF record, which if it exists will specify the IP addresses authorized by that domain's administrator. The result can be "pass", "fail", or some intermediate result - and systems will generally take this into account in their anti-spam filtering.

7. DMARC - Wikipedia

   en.wikipedia.org/wiki/DMARC

   These policies are published in the public Domain Name System (DNS) as text TXT records. DMARC does not directly address whether or not an email is spam or otherwise fraudulent. Instead, DMARC can require that a message not only pass DKIM or SPF validation, but that it also pass § Alignment. Under DMARC a message can fail even if it passes SPF ...