SPF validates that the sending mail server is authorized to send emails on behalf of a domain. The receiving email server checks if the sender’s IP address appears in a list of authorized IP addresses published in the domain’s DNS records.<\/p>\n\n\n\n
Example:<\/strong><\/p>\n\n\n\n DKIM adds a digital signature to emails using cryptographic verification. Like a handwritten signature on a check, this mathematical signature proves the email truly came from the claimed domain and hasn’t been tampered with in transit.<\/p>\n\n\n\n Example:<\/strong><\/p>\n\n\n\n DMARC builds upon SPF and DKIM by verifying that the domain in the “From” header (what users see) matches the domains validated by SPF and DKIM. It also tells receiving servers how to handle emails that fail these checks.<\/p>\n\n\n\n Why DMARC is important:<\/strong> While SPF verifies the sending server and DKIM verifies message integrity, neither ensures that the visible “From” address matches these authenticated domains. For example:<\/p>\n\n\n\n All three protocols use DNS TXT records to publish their policies. From the receiving server’s perspective:<\/p>\n\n\n\n Figure 1. Flow diagram of the relationship between SPF, DKIM and DMARC in email transmission.<\/em> <\/p>\n\n\n\n Email authentication protocols work together to validate your email messages and verify their senders. These protocols help prevent email spoofing and ensure messages come from legitimate sources. Here’s how each protocol works: Sender Policy Framework (SPF) SPF validates that the sending mail server is authorized to send emails on behalf of a domain. The receiving … Continue reading “Email Authentication Protocols – SPF, DKIM & DMARC”<\/span><\/a><\/p>\n","protected":false},"author":62,"featured_media":0,"parent":19,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1295","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/pages\/1295"}],"collection":[{"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/users\/62"}],"replies":[{"embeddable":true,"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/comments?post=1295"}],"version-history":[{"count":2,"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/pages\/1295\/revisions"}],"predecessor-version":[{"id":1303,"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/pages\/1295\/revisions\/1303"}],"up":[{"embeddable":true,"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/pages\/19"}],"wp:attachment":[{"href":"https:\/\/itp.nyu.edu\/networks\/wp-json\/wp\/v2\/media?parent=1295"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
<\/span>DomainKeys Identified Mail (DKIM) <\/span><\/h2>\n\n\n\n
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<\/span>Domain-based Message Authentication, Reporting and Conformance (DMARC) <\/span><\/h2>\n\n\n\n
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<\/span>Technical Implementation <\/span><\/h2>\n\n\n\n
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<\/span>Flowchart <\/span><\/h2>\n\n\n\n
![\"Flow](\"https:\/\/publish-01.obsidian.md\/access\/f90857fbefa5ad231dfb7167f9d3bf37\/_public\/_assets\/undnet\/eplainer_flow.png\")
<\/figure>\n\n\n\n<\/span>Reference <\/span><\/h2>\n\n\n\n
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