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  2. Sender Policy Framework - Wikipedia

    en.wikipedia.org/wiki/Sender_Policy_Framework

    Thus, the key issue in SPF is the specification for the new DNS information that domains set and receivers use. The records laid out below are in typical DNS syntax, for example: "v=spf1 ip4:192.0.2.0/24 ip4:198.51.100.123 a -all" "v=" defines the version of SPF used.

  3. List of DNS record types - Wikipedia

    en.wikipedia.org/wiki/List_of_DNS_record_types

    Address record. Returns a 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host, but it is also used for DNSBLs, storing subnet masks in RFC 1101, etc. AAAA. 28. RFC 3596 [2] IPv6 address record. Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.

  4. DMARC - Wikipedia

    en.wikipedia.org/wiki/DMARC

    In this example, the entity controlling the example.com DNS domain intends to monitor SPF and/or DKIM failure rates and doesn't expect email to be sent from subdomains of example.com. Note that a subdomain can publish its own DMARC record; receivers must check it out before falling back to the organizational domain record.

  5. DomainKeys Identified Mail - Wikipedia

    en.wikipedia.org/wiki/DomainKeys_Identified_Mail

    t. e. DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect forged sender addresses in email (email spoofing), a technique often used in phishing and email spam. DKIM allows the receiver to check that an email that claimed to have come from a specific domain was indeed authorized by the owner of that domain. [1]

  6. TXT record - Wikipedia

    en.wikipedia.org/wiki/TXT_record

    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 arbitrary text with a host or other name, such as human readable information about a server, network, data center, or other accounting information. [1]

  7. Authenticated Received Chain - Wikipedia

    en.wikipedia.org/wiki/Authenticated_Received_Chain

    Authenticated Received Chain. Authenticated Received Chain (ARC) is an email authentication system designed to allow an intermediate mail server like a mailing list or forwarding service to sign an email's original authentication results. This allows a receiving service to validate an email when the email's SPF and DKIM records are rendered ...

  8. Sender ID - Wikipedia

    en.wikipedia.org/wiki/Sender_ID

    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. [5]

  9. Wildcard DNS record - Wikipedia

    en.wikipedia.org/wiki/Wildcard_DNS_record

    Wildcard DNS record. A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither ...