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2. Sender Policy Framework - Wikipedia

   en.wikipedia.org/wiki/Sender_Policy_Framework

   Sender Policy Framework (SPF) is an email authentication method which ensures the sending mail server is authorized to originate mail from the email sender's domain. [1][2] This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection. If the email is bounced, a message is sent to ...

3. DMARC - Wikipedia

   en.wikipedia.org/wiki/DMARC

   DMARC operates by checking that the domain in the message's From: field (also called "RFC5322.From" [2]) is "aligned" with other authenticated domain names.If either SPF (specified using the aspf field) or DKIM (specified using the adkim) alignment checks pass, then the DMARC alignment test passes.

4. List of DNS record types - Wikipedia

   en.wikipedia.org/wiki/List_of_DNS_record_types

   5. RFC 1035 [1] Canonical name record. Alias of one name to another: the DNS lookup will continue by retrying the lookup with the new name. CSYNC. 62. RFC 7477. Child-to-Parent Synchronization. Specify a synchronization mechanism between a child and a parent DNS zone.

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. 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. Sender Rewriting Scheme - Wikipedia

   en.wikipedia.org/wiki/Sender_Rewriting_Scheme

   SRS is a form of variable envelope return path (VERP) inasmuch as it encodes the original envelope sender in the local part of the rewritten address. [2] Consider example.com forwarding a message originally destined to bob@example.com to his new address <bob@example.net>: