{"id":2161,"date":"2024-02-04T14:13:54","date_gmt":"2024-02-04T08:43:54","guid":{"rendered":"https:\/\/kdmarc.com\/blog\/?p=460"},"modified":"2024-08-12T11:44:03","modified_gmt":"2024-08-12T06:14:03","slug":"spf-authentication","status":"publish","type":"post","link":"https:\/\/threatcop.com\/blog\/spf-authentication\/","title":{"rendered":"Understanding SPF: Email Authentication Protocol"},"content":{"rendered":"\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\n<p style=\"text-align: center;\"><span style=\"color: #000000;\"><i><span style=\"font-weight: 400;\">\u201cMalicious actors send <\/span><\/i><b><i>3 billion spoofed emails every day<\/i><\/b><i><span style=\"font-weight: 400;\"> and since 2016, <\/span><\/i><b><i>organizations have lost over $26 billion<\/i><\/b><i><span style=\"font-weight: 400;\"> due to email attacks\u201d <\/span><\/i><span style=\"font-weight: 400;\">(Source: <\/span><\/span><a href=\"https:\/\/www.cnbc.com\/2019\/09\/11\/email-wire-fraud-cost-26-billion-since-2016-says-fbi.html\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"font-weight: 400;\"><strong><span style=\"color: #183994;\">CNBC<\/span><\/strong><\/span><\/a><span style=\"font-weight: 400;\">)<\/span><\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #414141;color:#414141\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #414141;color:#414141\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#What_is_the_Sender_Policy_Framework_SPF\" >What is the Sender Policy Framework (SPF)?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#Example_of_an_SPF\" >Example of an SPF<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#How_does_SPF_Work\" >How does SPF Work?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#How_to_Set_Up_SPF\" >How to Set Up SPF?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#Book_a_Free_Demo_Call_with_Our_People_Security_Expert\" >Book a Free Demo Call with Our People Security Expert<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#Enter_your_details\" >Enter your details<\/a><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#What_are_SPF_Records\" >What are SPF Records?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#How_to_Implement_SPF_Record\" >How to Implement SPF Record?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#SPF_Record_Syntax_Mechanism\" >SPF Record Syntax Mechanism<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#What_is_the_Record_Checker\" >What is the Record Checker?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#Limitations_of_Sender_Policy_Framework\" >Limitations of Sender Policy Framework?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/threatcop.com\/blog\/spf-authentication\/#Email_Security_is_the_Main_Defense_Against_Cyber_Attacks\" >Email Security is the Main Defense Against Cyber Attacks<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">Email phishing and spoofing are the two most widely used attack vectors to create widespread havoc. The <\/span><b>absence of email authentication standards can incur immense financial and reputational damage to the organization<\/b><span style=\"font-weight: 400;\">. There are several standards and protocols that are implemented <\/span><b>to improve the authenticity of outbound emails<\/b><span style=\"font-weight: 400;\">. They are SPF, DKIM, and DMARC. Each of these has its respective role and application.<\/span><\/span><\/p>\n<p><span style=\"font-weight: 400; color: #000000;\">In light of the alarming rise in email-based cyberattacks, <strong><span style=\"color: #183994;\"><a style=\"color: #183994;\" href=\"https:\/\/threatcop.com\/blog\/new-anti-spam-policy\/\">Yahoo and Google&#8217;s updated guidelines for bulk email senders<\/a><\/span><\/strong>, effective February 2024, underscore the urgency of adopting stringent email authentication measures. These guidelines mandate the implementation of SPF, DKIM, and DMARC for domain authentication, aiming to curb the spoofed emails sent daily and counter the loss that happens due to this.. By setting these standards, Google intends to bolster email safety, reduce spam, and ensure that organizations&#8217; email marketing efforts are both secure and successful. This initiative represents a critical step forward in the collective effort to enhance cybersecurity and protect against the financial and reputational damages wrought by email phishing and spoofing.<\/span><\/p>\n<p style=\"text-align: justify;\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">SPF is one of the popular email authentication standards that came into being around the early 2000s. It was taken into consideration when it occurred that SMTP (Simple Mail Transfer Protocol) has certain limitations. And now, 20 years down the line, the <strong>sender policy framework<\/strong><\/span><b>\u00a0has become an essential element for the cybersecurity of an organization<\/b><span style=\"font-weight: 400;\">. <\/span><\/span><\/p>\n\n\n<style type=\"text\/css\">\n      @media print, screen and (max-width: 63.99875em){\n      .tnp-submit\n      width: 48%;\n      }\n      .wp-block-tnp-minimal{\n      padding: 20px;\n      }\n      .blog_para\n      margin-top: 4px !important;\n      line-height: 25px !important;\n      font-size: 15px !important;\n      }\n\n      }\n      .blog_para{\n      font-family: jost,sans-serif;\n      margin-top: 14px;\n      margin-bottom: 30px;\n      color: #fff;\n      font-size: 15px !important;\n      color: black !important;\n\n      }\n\n      .wp-block-tnp-minimal{\n      padding:20px;\n      border: 1px solid grey;\n      }\n\n      .tnp-submit a{\n        background: #1d58c7!important;\n    border-radius: 5px!important;\n    text-transform: inherit!important;\n    padding: 8px 25px!important;\n    font-weight: 600!important;\n    color: #fff!important;\n    width: 30%!important;\n    border: none;\n      }\n\n      .blog_get{\n      font-size: 24px !important;\n      font-weight: 700;\n      padding-bottom: 0px;\n    font-family: 'Poppins' !important;\n      margin-bottom: 0px;\n      margin-top: 0px;\n      margin-bottom: 0px !important;\n      color: white;\n          line-height: 30px;\n          color: white;\n      }\n      .row{\n             display: flex;\n    flex-wrap: wrap;\n    flex-direction: row;\n    padding: 25px 0px 25px 36px;\n    align-items: center;\n\n      }\n\n.colLeft{\n         flex-basis:50%;\n    -webkit-box-flex: 0;\n    flex-grow: 0;\n    max-width: 50%;\n    color: white;\n}\n    \n .colRight{\n       flex-basis: 45%;\n    -webkit-box-flex: 0;\n    flex-grow: 0;\n    max-width: 50%;\n }\n\n.tnp-subscription-minimal{\n    float: right;\n}\n<\/style>\n<div style=\"max-width: 741px; margin: 0 auto; background-image: url('https:\/\/awareness.threatcop.ai\/marketing\/linkedinlowerbanner.webp'); background-repeat: no-repeat; background-size: cover; background-position: center; \">\n<div class=\"row\">\n<div class=\"colLeft\">\n<p class=\"blog_get\" style=\"font-family: 'Poppins' !important; color: white !important\">Subscribe to Our Newsletter On Linkedin<\/p>\n<p class=\"blog_para\" style=\"font-size: 16px;font-family: 'Poppins' !important; color: white !important; margin-top: 10px; margin-bottom: 28px;line-height: 25px;\">Sign up to Stay Tuned with the Latest Cyber Security News and Updates<\/p>\n\n<div>\n<div class=\"tnp\" style=\"margin-bottom: 10px;\">\n            <form action=\"https:\/\/threatcop.com\/newsletter-thank-you\" method=\"get\" target=\"_blank\">\n<div class=\"tnp-submit\">\n                  <a class=\"libutton\" href=\"https:\/\/www.linkedin.com\/build-relation\/newsletter-follow?entityUrn=7062043746430783488\" target=\"_blank\" rel=\"noopener\">Subscribe<\/a><\/div>\n<\/form><\/div>\n<\/div>\n<\/div>\n<div class=\"colRight\">\n<div>\n<div class=\"tnp tnp-subscription-minimal \">\n            <img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/marketing\/newsletter-icon.webp\" class=\"img-fluid\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Sender_Policy_Framework_SPF\"><\/span><span style=\"color: #000000;\"><b data-rich-text-format-boundary=\"true\">What is the Sender Policy Framework (SPF)?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\">The Sender Policy Framework is <b>an authentication technique<\/b> that is used <b>to mitigate the risks of email attacks<\/b>. Its primary objective is <b>to prevent phishing by detecting email forging and spoofing<\/b>. This policy uses technical methods to record DNS (Domain Name Service) and IP addresses so that they can be verified once an email is exchanged between two email servers.&nbsp;<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\">In common terms, it <b>prevents cybercriminals or spammers from sending emails on behalf of the organization\u2019s domain<\/b>. There are various methods to<\/span> <strong><a href=\"https:\/\/threatcop.com\/blog\/prevent-phishing-attacks\/\" rel=\"noopener noreferrer\"><span style=\"color: #183994;\">stop email phishing attacks<\/span><\/a><\/strong><span style=\"color: #000000;\">. The SPF enhances the level of authorization of email servers. The primary application of SPF is to assist organizations&#8217; domains to prevent spoofing and <b>prevent outbound emails from being marked as spam<\/b>.&nbsp;<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Example_of_an_SPF\"><\/span><span style=\"color: #000000;\"><b data-rich-text-format-boundary=\"true\">Example of an SPF<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\">SPF contains a series of text in the form of the syntax that contains the record of an IP address with a specific mechanism. One example is considered below.<\/span><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><span style=\"color: #000000;\"><strong>\u201c<i>v=spf1 ip4:166.5.50\/24 ip4:138.54.200.145 a -all<\/i>\u201d<\/strong><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list rich-text block-editor-rich-text__editable\">\n<li><span style=\"color: #000000;\">The parameter \u2018v\u2019 designates the version of SPF<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">The parameter \u2018ip4\u2019 designates the mechanism in the IPv4 network, where prefix length is assumed to be 32<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">The parameter \u2018a\u2019 designates the test of the domain record which contains the domain name of the organization<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">The parameter \u2018all\u2019 designates the match of the SPF record<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">The parameter \u2018-\u2019 just before all designates one of the four quantifiers for implementing the mechanism<\/span><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">More details on quantifier significance and its designation are explained later in the blog.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_does_SPF_Work\"><\/span><span style=\"color: #000000;\"><b>How does SPF Work?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">Every email has a header attached to it. When an employee from your organization sends the email, its header includes the \u2018Return-Path\u2019 value of the domain. Thus, the <\/span><b>Sender Policy Framework works by looking for the same \u2018Return-Path\u2019 value across the domain<\/b><span style=\"font-weight: 400;\">.<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">As the email reaches the receiving end, the receiving server checks this value and extracts the sender domain\u2019s SPF record. The receiving server tries to verify the domain IP address with that of the SPF record. If there is a match, then the receiver server authenticates the email domain.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The receiver server checks the senders\u2019 email addresses along with their IP addresses in the SPF record. This is done by checking the TXT record of the DNS. The overall method of verifying the email from a domain can be stated in the following steps:<\/span><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><span style=\"font-weight: 400; color: #000000;\">The administrator of an email domain establishes a policy that contains the names and information of email servers that are to be authorized. This policy is stored in the form of an SPF record, which is listed in the overall DNS records.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">When a mail server receives an incoming email, the policy framework seeks bounce rules (return path). Then, the inbound mail server conducts a comparison of the IP address from the sender&#8217;s mail server with the IP addresses listed in the SPF record.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">Upon verification and designation of rules, the domain\u2019s record makes a decision on whether to accept, reject or flag the email.<\/span><\/li>\n<\/ol>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"1602\" height=\"1653\" src=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100.jpg\" alt=\"SPF\" class=\"wp-image-7933\" srcset=\"https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100.jpg 1602w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-291x300.jpg 291w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-992x1024.jpg 992w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-768x792.jpg 768w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-1489x1536.jpg 1489w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-80x83.jpg 80w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-485x500.jpg 485w, https:\/\/threatcop.com\/blog\/wp-content\/uploads\/2022\/05\/SPF@2x-100-775x800.jpg 775w\" sizes=\"auto, (max-width: 1602px) 100vw, 1602px\" \/><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Set_Up_SPF\"><\/span><span style=\"color: #000000;\"><b>How to Set Up SPF?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">There are some fundamental steps that are essentially carried out to set up the senders&#8217; policy framework. They are-<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>Step 1: Collecting IP addresses from which emails are to be sent<\/b><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">In this step, the sender policy framework implementation requires the identification of the mail servers of an organization. These servers are the email service provider\u2019s servers, web servers, office mail servers, end-user mailbox providers, or any third-party servers.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>Step 2: Compose a List of Sending Domains of the Organization<\/b><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The SPF record must contain a list of all the domains that are associated with the organization. These domains must be protected with SPF even if they aren\u2019t used for sending mail.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>Step 3: Create a Sender Policy Framework Record<\/b><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The purpose of this policy is to authenticate email by comparing the IP address of the sender with the list of IP addresses in the record. Thus, these records are created to create an exhaustive list of addresses that will be used for authentication. The creation of the record is described later in the blog.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>Step 4: Sender Policy Framework is Published on DNS<\/b><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The DNS&nbsp; server administrator publishes the records to DNS. The domain provides a web-based application for it. On the other hand, an external tool can be employed to carry out the whole procedure.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>Step 5: Validation and Testing<\/b><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">This step involves testing the record using the sender policy framework checker tool.<\/span><\/p>\n\n\n\n<!DOCTYPE html>\n<html lang=\"en\">\n\n<head>\n    <meta charset=\"UTF-8\">\n    <meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">\n    <meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n    <title>Document<\/title>\n<\/head>\n\n<style>\n    .interestedBtn {\n        width: 80% !important;\n        box-sizing: border-box !important;\n        display: inline-block !important;\n        padding: 11px !important;\n        border: 1px !important;\n        border-color: #ddd !important;\n        margin-top: 10px !important;\n        background-color: #183e8b !important;\n        background-image: none !important;\n        text-shadow: none !important;\n        color: #fff !important;\n        font-size: 14px !important;\n        line-height: 20px !important;\n        border-radius: 5px !important;\n        margin: 0 !important;\n        cursor: pointer !important;\n        box-shadow: 0px 4.66px 22.99px 0px rgba(0, 0, 0, 0.10);;\n    }\n\n\n        .formSec .formSecTwo{\n            padding-top: 15px !important;\n            margin-bottom: 30px !important;\n        }\n\n\n    .tnp-email {\n        width: 80% !important;\n        box-sizing: border-box;\n        padding: 8px 10px;\n        display: inline-block;\n        border: 1px solid #ced4da;\n        background: #fff;\n        color: #000 !important;\n        font-size: 13px;\n        line-height: 20px;\n        border-radius: 2px;\n        padding-right: 30px;\n        margin-bottom: 0px;\n    }\n\n    .formSec {\n        border: 1px solid #ced4da;\n        float: left !important;\n        width: 55% !important;\n    }\n\n    .mainBox {\n       \/* border: 1px solid #183e8b;*\/\n         background: white;\n        max-width: 600px !important;\n        margin: 0 auto !important;\n        padding: 20px !important;\n        font-family: Arial, Helvetica, sans-serif !important;\n    }\n\n    .boxDiv {\n        display: flex !important;\n    }\n\n    .boxConsult {\n        float: left !important;\n        width: 45% !important;\n        padding: 10px !important;\n    }\n\n    .formSecTwo {\n        text-align:center !important;\n        width: 100% !important;\n    }\n\n    .formHeading {\n        font-family: Arial, Helvetica, sans-serif;\n        margin-top: 0px;\n        font-weight: 700;\n        line-height: 25px;\n        font-size: 18px !important;\n        \n       margin-bottom: 60px !important;\n       color: #000!important;\n          margin-top: 5px !important;\n    }\n\n    .fieldHeading {\n        margin: 0 !important;\n        font-size: 13px !important;\n        text-align: left !important;\n        margin: 0px 39px 2px 93px !important;\n        font-weight: 500 !important;\n    }\n\n    .image {\n        max-width:90% !important;\n        height: auto !important;\n    }\n\n     .email-icon {\n            position: absolute;\n            right: 50px;\n             top: 20px;\n            transform: translateY(-50%);\n            pointer-events: none; \n        }\n\n          .email-container{\n             position: relative;\n         \n        }\n       \n\n        .email-icon img{\n                 width: 15px;\n        }\n\n\n         input::placeholder {\n            color:#495057;\n        }\n\n\n     ::placeholder {\n        color: #495057;\n    }\n\n        ::-ms-input-placeholder { \n          color:#495057;\n        }\n\n\n        input:-webkit-autofill {\n            background-color: transparent !important;\n            -webkit-box-shadow: 0 0 0px 1000px white inset !important; \n            box-shadow: 0 0 0px 1000px white inset !important;\n            color: #495057 !important; \n        }\n\n        \n        input {\n            color:#495057 !important;\n        }\n\n\n    @media screen and (max-width: 480px) {\n        .boxDiv {\n            display: block !important;\n            padding: 15px !important;\n         \n        }\n\n        .image{\n        width: 80% !important;\n         margin-bottom: 14px;\n        }\n        .fieldHeading {\n            text-align: left !important;\n            margin: unset !important;\n        }\n\n        .boxConsult {\n            width: unset !important;\n            float: none !important;\n        }\n\n        .mainBox {\n            border: unset !important;\n        }\n\n        .formSec {\n            float: unset !important;\n            width: 100% !important;\n        }\n\n        .formSecTwo {\n            text-align: center !important;\n        }\n\n        .tnp-email {\n            width: 90% !important;\n        }\n\n        .formHeading {\n            margin-bottom: unset !important;\n        }\n\n         .email-icon {\n            position: absolute;\n            right: 25px;\n            top: 58%;\n            transform: translateY(-50%);\n            pointer-events: none; \/* Make sure the icon doesn't block clicking on the input *\/\n        }\n       \n        .email-container{\n             position: relative;\n        }\n\n    }\n<\/style>\n\n<body>\n\n    <div class=\"mainBox\" box-sizing:=\"\" border-box;=\"\">\n\n        <div class=\"boxDiv\">\n\n            <div class=\"boxConsult\">\n                <div>\n                    <h3 class=\"formHeading\" style=\" font-size: 16px !important;\"><span class=\"ez-toc-section\" id=\"Book_a_Free_Demo_Call_with_Our_People_Security_Expert\"><\/span>\n                        Book a Free Demo Call with Our People Security Expert<span class=\"ez-toc-section-end\"><\/span><\/h3>\n                <\/div>\n                <img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/form.svg\" class=\"image\">\n            <\/div>\n\n            <div class=\"formSec\">\n                <div class=\" formSecTwo\">\n                    <h4 style=\"margin-top: 0; font-size: 16px !important;\"><span class=\"ez-toc-section\" id=\"Enter_your_details\"><\/span>Enter your details<span class=\"ez-toc-section-end\"><\/span><\/h4>\n                    <div class=\"tnp tnp-subscription-minimal\">\n                        <form action=\"https:\/\/threatcop.com\/thankyou-blog\" method=\"get\" target=\"_blank\">\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n\n                                <input class=\"tnp-email\" type=\"text\" required=\"\" name=\"FullName\" value=\"\"\n                                    placeholder=\"Full Name\">\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon01.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n                               \n                                <input class=\"tnp-email\" type=\"email\" required=\"\" name=\"email\" value=\"\"\n                                    placeholder=\"Corporate Email Id\">\n                                     <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon02.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n\n                            <div class=\"email-container\" style=\"margin-bottom:20px;\">\n                               \n                                <input class=\"tnp-email\" type=\"text\" required=\"\" name=\"CompanyName\" value=\"\"\n                                    placeholder=\"Company Name\">\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon03.svg\" class=\"img-fluid\" \/><\/span>\n\n                            <\/div>\n\n                            <div class=\"email-container\">\n                               \n                                <input class=\"tnp-email\" type=\"number\" required=\"\" name=\"Phone\" value=\"\"\n                                    placeholder=\"Phone No.\"><br>\n                                    <span class=\"email-icon\"><img decoding=\"async\" src=\"https:\/\/awareness.threatcop.ai\/threatcop_blog\/icon04.svg\" class=\"img-fluid\" \/><\/span>\n                            <\/div>\n                            <input type=\"hidden\" name=\"BlogForm\" value=\"BlogForm\"><br>\n                            <input class=\"tnp-submit interestedBtn\" name=\"submit\" type=\"submit\"\n                                value=\"SUBMIT\">\n\n                        <\/form>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n        <\/div>\n    <\/div>\n\n<\/body>\n\n<\/html>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_are_SPF_Records\"><\/span><span style=\"color: #000000;\"><b>What are SPF Records?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">An SPF record is a DNS record, which is a database of records. These <\/span><b>records are used to map a particular URL to a respective IP address<\/b><span style=\"font-weight: 400;\">. They are stored on DNS servers, or more commonly, email domain servers. These servers act as a medium of connection between an organization and the outside cyber world.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">An SPF record <\/span><b>registers the pool of IP addresses that are associated with the senders\u2019 email server<\/b><span style=\"font-weight: 400;\">. When emails from your organization reach the receiver\u2019s end, the receiver\u2019s domain server starts checking the SPF record, based on the DNS record and authenticates your email. When the email authentication is completed, it is sent to the email application and becomes visible in the inbox of the receiver.<\/span><\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Implement_SPF_Record\"><\/span><span style=\"color: #000000;\"><b>How to Implement SPF Record?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The implementation and registration of the domains in the SPF record is an easy task. If a company or an organization wants you to register their domain in your SPF record, they will send a description of their entry. The domains may have one SPF record each whereas the record can specify multiple servers.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">The Sender Policy Framework record is implemented in the form of a DNS TXT record, which can have a maximum character size of 255 characters. The size of this<\/span><b> TXT file should not be more than 512 bytes<\/b><span style=\"font-weight: 400;\">. The procedure of implementation involves a syntactic understanding of the elements that comprise the SPF record. Each of the elements has a respective set of parameters, which designate particular conditions and activities for various situations.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">From the example of the SPF record which is used above, you can understand the basic structure of the syntax of the record consists of quantifiers and mechanisms. There are four quantifiers and eight mechanisms, where each of them is to signify a set of records, which has a specific application in terms of implementation. Finally, the created record is placed on the domain server.<\/span><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"SPF_Record_Syntax_Mechanism\"><\/span><span style=\"color: #000000;\"><b>SPF Record Syntax Mechanism<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The notion of the SPF record mechanism is to describe There are primarily four qualifiers, where each of them is represented by one of the following prefixes:&nbsp;<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"color: #000000;\"><b>\u201c+\u201d (Pass)<\/b><span style=\"font-weight: 400;\">: This indicates an SPF record to allow \u2018<\/span><i><span style=\"font-weight: 400;\">send<\/span><\/i><span style=\"font-weight: 400;\">\u2019 from hosts and the intended action is \u2018<\/span><i><span style=\"font-weight: 400;\">Accept<\/span><\/i><span style=\"font-weight: 400;\">\u2019.<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>\u201c-\u201d (Fail)<\/b><span style=\"font-weight: 400;\">: This indicates the SPF record to NOT allow hosts to send, and the intended action is \u2018<\/span><i><span style=\"font-weight: 400;\">Reject<\/span><\/i><span style=\"font-weight: 400;\">\u2019.<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>\u201c~\u201d (SoftFail)<\/b><span style=\"font-weight: 400;\">: This indicates an SPF record to NOT allow hosts to send but let it in \u2018<\/span><i><span style=\"font-weight: 400;\">transition<\/span><\/i><span style=\"font-weight: 400;\">\u2019, where the intended action is \u2018<\/span><i><span style=\"font-weight: 400;\">Accept but Mark<\/span><\/i><span style=\"font-weight: 400;\">\u2019.<\/span><\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\"><b>\u201c?\u201d (Neutral)<\/b><span style=\"font-weight: 400;\">: This indicates the SPF record explicitly states nothing for validity, and the intended action is \u2018<\/span><i><span style=\"font-weight: 400;\">Accept<\/span><\/i><span style=\"font-weight: 400;\">\u2019.<\/span><\/span><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_the_Record_Checker\"><\/span><span style=\"color: #000000;\"><b>What is the Record Checker?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">The <strong><a href=\"https:\/\/threatcop.com\/spf-record-checker\" rel=\"noopener noreferrer\"><span style=\"color: #183994;\">SPF record checker<\/span><\/a><\/strong> is a diagnostic tool that <\/span><b>performs the comprehensive role of SPF record lookup and validator<\/b><span style=\"font-weight: 400;\">. This tool is used to look for a specific domain name in a record, display it, and run a series of diagnostic tests such as SPF validation that highlight the errors that could have an adverse impact on email delivery.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The record allows the organization\u2019s domain to publish a list of subnets and IP addresses, which is further used to authorize emails on behalf of the organization. The purpose of this tool is to ensure spam reduction and fraudulent activity.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Limitations_of_Sender_Policy_Framework\"><\/span><span style=\"color: #000000;\"><b>Limitations of Sender Policy Framework?<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"font-weight: 400; color: #000000;\">The Sender Policy Framework is an excellent technique implemented for email authentication. And yet it has several limitations that an organization must be aware of to employ resolution tools. Some of those limitations are:<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-weight: 400; color: #000000;\">They do not validate or authenticate the \u2018From\u2019 header. This header is visible for most of the senders and they cannot be validated.\u00a0<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">They can not be validated if the emails are forwarded, because the forwarding domain becomes the sender. Thus, the genuineness of the original sender cannot be ensured.<\/span><\/li>\n\n\n\n<li><span style=\"font-weight: 400; color: #000000;\">There is no mechanism of reporting.<\/span><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Email_Security_is_the_Main_Defense_Against_Cyber_Attacks\"><\/span><span style=\"color: #000000;\"><b>Email Security is the Main Defense Against Cyber Attacks<\/b><\/span><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><b>SPF itself is not a complete solution<\/b><span style=\"font-weight: 400;\">. It is often required for cyber experts to implement other email authentication techniques such as DKIM and DMARC, along with SPF, to provide a comprehensive solution. Thus, it is very <\/span><b>important for organizations to implement this authentication technique to ensure that emails are not spammed or spoofed<\/b><span style=\"font-weight: 400;\">. The primary role of SPF is to enhance the authenticity of outbound emails for the organization.<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><span style=\"font-weight: 400;\">The <\/span><b>implementation of SPF is a challenging and technical task<\/b><span style=\"font-weight: 400;\">. It <\/span><b>requires a highly technical expert<\/b><span style=\"font-weight: 400;\">, who has to carry out the process of SPF implementation very carefully. There are <\/span><b>multiple chances of errors, and a single mistake can destroy the reputation and authenticity of the whole domain of the organization<\/b><span style=\"font-weight: 400;\">. That\u2019s why implementing SPF is a tedious process that is also risky. So, an organization should employ tools that can implement SPF easily and risk-free.&nbsp;<\/span><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><em><span style=\"font-size: inherit;\">How would you implement SPF in an appropriate way?<\/span><\/em><\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><strong>TDMARC<\/strong> brings a <strong>dynamic way of implementing smart SPF<\/strong> that carry out prominent procedure of <strong>eliminating and whitelisting IP addresses<\/strong>. It provides interactive interface to make SPF record and update in DNS server.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000; font-size: inherit;\"><a href=\"https:\/\/threatcop.com\/tdmarc\" rel=\"noopener noreferrer\"><strong><span style=\"color: #183994;\">TDMARC<\/span><\/strong><\/a> is the best tool on the market that provides a simple mechanism to implement SPF, DKIM, and DMARC. The <\/span><span style=\"color: #000000;\"><b style=\"font-size: inherit;\">biggest advantage of using TDMARC is that it provides an instant mechanism for configuring, managing, and implementing SPF<\/b><span style=\"font-size: inherit;\">. <\/span><\/span><span style=\"color: #000000;\"><span style=\"font-size: inherit;\">It facilitates following features:<\/span><\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"color: #000000;\">Monitoring multiple email domains<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">Defending organization&#8217;s domain against phishing and spoofing<\/span><\/li>\n\n\n\n<li><span style=\"color: #000000;\">Increasing email delivering rate<\/span><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><span style=\"color: #000000;\"><strong>Editor\u2019s Note:<\/strong> This post was originally published on 2nd February 2022 and has been partially revamped and updated for accuracy and comprehensiveness.<\/span><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u201cMalicious actors send 3 billion spoofed emails every day and since 2016, organizations have lost over $26 billion due to email attacks\u201d (Source: CNBC) Email phishing and spoofing are the two most widely used attack vectors to create widespread havoc. The absence of email authentication standards can incur immense financial and reputational damage to the [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":10963,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[46,45],"tags":[],"class_list":["post-2161","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dmarc","category-email-security"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sender Policy Framework (SPF): Email Authentication Protocol<\/title>\n<meta name=\"description\" content=\"An SPF is email authenticaton technique that increments a layer of email domain security. 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