{"id":3573,"date":"2025-11-03T07:43:18","date_gmt":"2025-11-03T07:43:18","guid":{"rendered":"https:\/\/emailwarmup.com\/blog\/?p=3573"},"modified":"2026-03-06T23:56:50","modified_gmt":"2026-03-06T23:56:50","slug":"spf-record","status":"publish","type":"post","link":"https:\/\/emailwarmup.com\/blog\/email-authentication\/spf-record\/","title":{"rendered":"What Is The SPF Record &amp; How To Implement It"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1348\" height=\"785\" src=\"https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png\" alt=\"How-To-Implement-SPF-Record\" class=\"wp-image-4186\"\/><\/figure>\n\n\n\n<p>An SPF (Sender Policy Framework) record lists which servers can send email for your domain. The record acts as a guest list \u2014 if a server isn&#8217;t on it, receiving servers treat the email as suspicious (or reject it outright).<\/p>\n\n\n\n<p>SPF lives in DNS as a TXT record. When someone receives an email claiming to be from your domain, the receiving server checks your SPF. If the sender&#8217;s IP matches your authorized list, authentication passes. If not, the email fails.<\/p>\n\n\n\n<p>Microsoft changed the stakes in May 2025. Sending more than 5,000 emails daily without SPF, <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dkim\">DKIM<\/a>, and <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dmarc\">DMARC<\/a> now triggers automatic rejection (error code 550 5.7.515). Your messages don&#8217;t reach spam \u2014 they bounce completely.<\/p>\n\n\n\n<p>What you&#8217;ll learn:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>SPF record components and syntax<\/li>\n\n\n\n<li>Step-by-step setup process<\/li>\n\n\n\n<li>The 10-lookup limit (and workarounds)<\/li>\n\n\n\n<li>Common mistakes that break authentication<\/li>\n\n\n\n<li>Why SPF alone isn&#8217;t enough<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the components of an SPF record?<\/h2>\n\n\n\n<p>Every SPF record follows strict syntax defined by RFC 7208. Deviate from the format, and receiving servers ignore your entire record (no partial credit here).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Version tag<\/h3>\n\n\n\n<p>Your record must start with v=spf1 \u2014 lowercase, no exceptions. A missing or incorrect version tag causes immediate failure.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mechanisms<\/h3>\n\n\n\n<p>Mechanisms define who&#8217;s authorized to send email for your domain. Servers check them left to right, stopping at the first match.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Mechanism<\/td><td>What it does<\/td><td>Counts toward lookup limit?<\/td><\/tr><tr><td>ip4<\/td><td>Authorizes IPv4 addresses or ranges<\/td><td>No<\/td><\/tr><tr><td>ip6<\/td><td>Authorizes IPv6 addresses or ranges<\/td><td>No<\/td><\/tr><tr><td>a<\/td><td>Authorizes servers in your A record<\/td><td>Yes<\/td><\/tr><tr><td>mx<\/td><td>Authorizes servers in your MX record<\/td><td>Yes<\/td><\/tr><tr><td>include<\/td><td>References another domain&#8217;s SPF record<\/td><td>Yes<\/td><\/tr><tr><td>all<\/td><td>Catches everything not matched earlier<\/td><td>No<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The include mechanism matters most when using third-party services. Sending through SendGrid? You need include:sendgrid.net so their servers can send on your behalf.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Qualifiers<\/h3>\n\n\n\n<p>Qualifiers tell receiving servers what action to take when a mechanism matches. A single character prefixes each mechanism.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Qualifier<\/td><td>Symbol<\/td><td>What happens<\/td><\/tr><tr><td>Pass<\/td><td>+<\/td><td>Email authenticated<\/td><\/tr><tr><td>Fail<\/td><td>&#8211;<\/td><td>Email should be rejected<\/td><\/tr><tr><td>Soft Fail<\/td><td>~<\/td><td>Email accepted but marked suspicious<\/td><\/tr><tr><td>Neutral<\/td><td>?<\/td><td>No specific action<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Most records end with either -all (strict rejection) or ~all (soft fail). <em>Never<\/em> use +all \u2014 it authorizes every IP address on the planet to send as your domain. One Reddit thread put it bluntly: &#8220;Only with over-permissive SPF records. (i.e. don&#8217;t use +all).&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Limits<\/h3>\n\n\n\n<p>SPF has two hard constraints that catch people off guard:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>10 DNS lookups maximum: Each include, a, mx, and exists mechanism counts toward the limit<\/li>\n\n\n\n<li>One SPF record per domain: Multiple records cause immediate PermError failure<\/li>\n<\/ul>\n\n\n\n<p>As one r\/proofpoint user noted: &#8220;The issues occur when it&#8217;s more than 10 DNS lookups.&#8221; Exceeding the limit doesn&#8217;t work at all \u2014 authentication breaks entirely.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How do you set up an SPF record?<\/h2>\n\n\n\n<p>Setting up SPF takes about 40 minutes (excluding DNS propagation). The process requires listing your senders, building the record, and publishing to DNS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. List senders<\/h3>\n\n\n\n<p>Make a complete list of every server and service sending email on your domain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Internal mail server<\/li>\n\n\n\n<li>Email platform (Google Workspace, Microsoft 365)<\/li>\n\n\n\n<li>Marketing tools (Mailchimp, <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/klaviyo-spf-record\/\">Klaviyo<\/a>, HubSpot)<\/li>\n\n\n\n<li>Transactional services (SendGrid, Amazon SES, Postmark)<\/li>\n\n\n\n<li>CRM systems (Salesforce, Pipedrive)<\/li>\n\n\n\n<li>Support platforms (Zendesk, Intercom)<\/li>\n<\/ul>\n\n\n\n<p>Missing even one source means those emails fail authentication. You&#8217;ll only discover the problem when customers complain (or worse, never reach out at all).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Build record<\/h3>\n\n\n\n<p>Create your SPF string using the format: v=spf1 [mechanisms] [qualifier]all<\/p>\n\n\n\n<p>Example:<\/p>\n\n\n\n<p>v=spf1 ip4:192.0.2.0\/24 include:_spf.google.com include:sendgrid.net -all<\/p>\n\n\n\n<p>The record above authorizes a specific IP range, Google Workspace, and SendGrid. The -all at the end rejects everything else.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Publish to DNS<\/h3>\n\n\n\n<p>Log in to your domain registrar (GoDaddy, Cloudflare, Namecheap) and navigate to DNS management. Create a new TXT record:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Field<\/td><td>Value<\/td><\/tr><tr><td>Host\/Name<\/td><td>@ or leave blank<\/td><\/tr><tr><td>Type<\/td><td>TXT<\/td><\/tr><tr><td>Value<\/td><td>Your SPF string<\/td><\/tr><tr><td>TTL<\/td><td>3600 (or default)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>DNS changes can take up to 48 hours to propagate globally (though most updates complete within hours).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Handle subdomains<\/h3>\n\n\n\n<p>Publish SPF records on any domain or subdomain that sends email. If marketing.yourcompany.com sends campaigns, create a separate TXT record for that subdomain.<\/p>\n\n\n\n<p>Subdomains that <em>don&#8217;t<\/em> send email can use an empty SPF (v=spf1 -all) to prevent spoofing. The empty record explicitly blocks all senders.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Validate record<\/h3>\n\n\n\n<p>Use free SPF checking tools to verify your record works:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MXToolbox SPF Record Lookup<\/li>\n\n\n\n<li><a href=\"https:\/\/emailwarmup.com\/spf-lookup\">SPF Checker<\/a> by EmailWarmup.com<\/li>\n\n\n\n<li>SPF.guru<\/li>\n\n\n\n<li>DMARClytics SPF Checker<\/li>\n<\/ul>\n\n\n\n<p>Run tests after every change. The tools catch syntax errors, multiple-record issues, and lookup limit violations before they tank <a href=\"https:\/\/emailwarmup.com\/blog\/email-deliverability\/what-is-email-deliverability\/\">deliverability<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How do you stay under the 10-lookup limit?<\/h2>\n\n\n\n<p>The 10-lookup limit exists to prevent DDoS attacks, but it creates headaches for companies using multiple email services. Each include statement triggers a DNS lookup \u2014 and nested includes count too.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Count lookups<\/h3>\n\n\n\n<p>Check your current count before adding new services. Tools like MXToolbox or SPF.guru show exactly how many lookups your record uses. Moreover, nested includes (services that include other services) can push you over the limit without warning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Subdomain strategy<\/h3>\n\n\n\n<p>Push some vendors onto subdomains so each manages its own SPF record. Marketing emails from marketing.yourcompany.com get a separate SPF record, freeing up lookups on your main domain.<\/p>\n\n\n\n<p>One r\/devops commenter recommended: &#8220;A good approach is to push some vendors onto subdomains so they manage their own SPF.&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Central relay<\/h3>\n\n\n\n<p>Route all outbound mail through a single relay or provider. Instead of authorizing five different services, you authorize one relay that handles everything. However, the setup adds complexity (and creates a single point of failure).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SPF flattening<\/h3>\n\n\n\n<p><a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/spf-flattening\/\">SPF flattening<\/a> converts include statements to direct IP addresses, eliminating DNS lookups. The downside is that IP addresses change without notice.<\/p>\n\n\n\n<p>As one sysadmin warned: &#8220;Flattening is possible, but I&#8217;d only use it if there&#8217;s no other way since it&#8217;s hard to keep updated.&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Hosted SPF<\/h3>\n\n\n\n<p>Services like Proofpoint&#8217;s EFD or Valimail manage your SPF record dynamically.&nbsp;<\/p>\n\n\n\n<p>Hosted SPF solutions bypass the 10-lookup limit through macro expansion. For complex email setups, hosted SPF might be the only practical solution.<\/p>\n\n\n\n<p>One r\/proofpoint user claimed: &#8220;Hosted SPF with Proofpoint is the only way SPF records should be handled.&#8221;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What about the 255-character limit?<\/h2>\n\n\n\n<p>SPF records can exceed 255 characters, but DNS TXT records have a 255-character limit <em>per string<\/em>. For longer records, you must split the value into multiple strings within the same TXT record.<\/p>\n\n\n\n<p>Most DNS hosts with web interfaces handle splitting automatically. As one r\/sysadmin user clarified: &#8220;SPF records can be longer than 255 characters, but DNS TXT record strings are limited to 255 characters so you have to use multiple strings.&#8221;<\/p>\n\n\n\n<p>If your provider doesn&#8217;t auto-split, format the record like this:<\/p>\n\n\n\n<p>&#8220;v=spf1 include:_spf.google.com include:sendgrid.net &#8221; &#8220;include:servers.mcsv.net -all&#8221;<\/p>\n\n\n\n<p>The receiving server concatenates the strings before processing. However, the total record length has a practical limit of about 512 bytes \u2014 beyond that, UDP truncation can cause issues.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How does SPF work with subdomains?<\/h2>\n\n\n\n<p>Subdomains that send email need their own SPF records. The main domain&#8217;s SPF doesn&#8217;t automatically apply to subdomains (a common misconception).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Sending subdomains<\/h3>\n\n\n\n<p>If marketing.yourcompany.com sends campaigns, create a separate TXT record:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Host<\/td><td>Value<\/td><\/tr><tr><td>marketing<\/td><td>v=spf1 include:servers.mcsv.net -all<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Non-sending subdomains<\/h3>\n\n\n\n<p>Subdomains that <em>don&#8217;t<\/em> send email should use an empty SPF to prevent spoofing:<\/p>\n\n\n\n<p>v=spf1 -all<\/p>\n\n\n\n<p>The record explicitly blocks all senders \u2014 protecting unused subdomains from abuse.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What mistakes kill SPF authentication?<\/h2>\n\n\n\n<p>Six errors account for most SPF failures. Each one can tank your <a href=\"https:\/\/emailwarmup.com\/blog\/email-deliverability\/sender-reputation\/\">sender reputation<\/a> overnight.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Multiple records<\/h3>\n\n\n\n<p>Your domain can have only one SPF TXT record. Creating two (often by accident when adding a new service) causes PermError. Receiving servers see conflicting records and fail authentication automatically.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Lookup overflow<\/h3>\n\n\n\n<p>Exceeding 10 DNS lookups triggers immediate failure. The record doesn&#8217;t work partially \u2014 it breaks completely. Audit your lookups quarterly, especially after adding new email services.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Syntax errors<\/h3>\n\n\n\n<p>A misplaced space, a missing version tag, or an unsupported character breaks everything. The version tag must be exactly v=spf1 (lowercase). SPF syntax either works perfectly or fails completely (no graceful degradation).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Overly permissive<\/h3>\n\n\n\n<p>The +all qualifier authorizes every IP address on Earth to send as your domain. Stick with -all or ~all at the end of your record.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Stale references<\/h3>\n\n\n\n<p>When you cancel an email service, remove the include from your SPF record. Dead references waste DNS lookups. Most people forget until deliverability tanks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dangling domains<\/h3>\n\n\n\n<p>When referencing domains via include or CNAME, ensure they remain registered. One security-focused Redditor flagged the risk: &#8220;There&#8217;s also dangling CNAMEs to consider&#8230; a threat actor can take over said unregistered or expired domain&#8230; and start sending mail as it, passing SPF.&#8221;<\/p>\n\n\n\n<p>If a referenced domain expires, an attacker can register it and start sending authenticated email as your domain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why can&#8217;t you rely on SPF record alone?<\/h2>\n\n\n\n<p>SPF protects only the hidden Return-Path address used for routing, not the visible &#8220;From&#8221; address recipients see. A sophisticated spammer can pass SPF using their own domain in the Return-Path while forging your brand in the From field.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The alignment gap<\/h3>\n\n\n\n<p>Recipients see an email that <em>appears<\/em> to come from your company, but SPF doesn&#8217;t verify the visible From address. Additionally, email forwarding breaks SPF \u2014 the forwarding server&#8217;s IP won&#8217;t match your record.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Complete protection<\/h3>\n\n\n\n<p>Running SPF without <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dkim\">DKIM<\/a> and <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dmarc\">DMARC<\/a> leaves massive security gaps:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Protocol<\/td><td>What it verifies<\/td><td>Standalone protection<\/td><\/tr><tr><td>SPF<\/td><td>Sending server IP<\/td><td>Partial<\/td><\/tr><tr><td>DKIM<\/td><td>Message content integrity<\/td><td>Partial<\/td><\/tr><tr><td>DMARC<\/td><td>Alignment + policy enforcement<\/td><td>Complete (with SPF + DKIM)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>DKIM adds cryptographic signatures to verify message content. DMARC ties SPF and DKIM together and tells receiving servers how to handle failures. For <a href=\"https:\/\/emailwarmup.com\/blog\/email-deliverability\/gmail-and-yahoo-bulk-sender-requirements\/\">Gmail and Yahoo bulk sender requirements<\/a>, you need all three configured and aligned.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Need help with SPF setup?<\/h2>\n\n\n\n<p>SPF mistakes cascade into deliverability problems that damage sender reputation. Getting authentication right the first time saves weeks of troubleshooting.<\/p>\n\n\n\n<p>Our <a href=\"https:\/\/emailwarmup.com\/email-deliverability-consultant\">email deliverability consultants<\/a> handle the complete authentication stack \u2014 SPF, DKIM, and DMARC. We audit your email infrastructure, configure records correctly, and monitor authentication health ongoing.<\/p>\n\n\n\n<p>What we handle:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lookup limit management<\/li>\n\n\n\n<li><a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dkim\">DKIM<\/a> and <a href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/dmarc\">DMARC<\/a> configuration<\/li>\n\n\n\n<li>Ongoing authentication monitoring<\/li>\n\n\n\n<li><a href=\"https:\/\/emailwarmup.com\/spf-generator\" target=\"_blank\" rel=\"noreferrer noopener\">SPF record creation<\/a> and optimization<\/li>\n<\/ul>\n\n\n\n<p>Book a free consultation and fix your email authentication for good.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<p>Here are some commonly asked questions about SPF record:<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1772841258399\"><strong class=\"schema-faq-question\">Can I use the same SPF record for multiple domains?<\/strong> <p class=\"schema-faq-answer\">No, each domain needs its own SPF TXT record. However, you can use the redirect modifier to point multiple domains to a shared record (only works when you control all domains and they share the same mail infrastructure).<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772841264360\"><strong class=\"schema-faq-question\">How often should I update my SPF record?<\/strong> <p class=\"schema-faq-answer\">Update immediately when adding or removing email services. Audit quarterly to remove dead references. Stale include statements waste DNS lookups and create security gaps (dangling references can be hijacked).<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772841269482\"><strong class=\"schema-faq-question\">What happens if my SPF record exceeds 255 characters?<\/strong> <p class=\"schema-faq-answer\">Split the record into multiple strings within the same TXT record. Most DNS providers handle splitting automatically. The receiving server concatenates strings before processing.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772841277485\"><strong class=\"schema-faq-question\">Does SPF work with email forwarding?<\/strong> <p class=\"schema-faq-answer\">SPF breaks when emails are forwarded. The forwarding server&#8217;s IP won&#8217;t match your SPF record. DMARC with relaxed alignment and SRS (Sender Rewriting Scheme) helps mitigate forwarding issues.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772841283870\"><strong class=\"schema-faq-question\">What&#8217;s the difference between -all and ~all?<\/strong> <p class=\"schema-faq-answer\">-all (hard fail) instructs receivers to reject unauthorized senders. ~all (soft fail) marks unauthorized emails as suspicious but still delivers them. Use -all for maximum security once you&#8217;ve verified all legitimate senders.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1772841291756\"><strong class=\"schema-faq-question\">How long does SPF DNS propagation take?<\/strong> <p class=\"schema-faq-answer\">Usually a few hours, but up to 48 hours globally. If changes don&#8217;t appear after 48 hours, double-check your record syntax and ensure you&#8217;re editing the correct DNS zone.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>An SPF (Sender Policy Framework) record lists which servers can send email for your domain. The record acts as a guest list \u2014 if a server isn&#8217;t on it, receiving servers treat the email as suspicious (or reject it outright). SPF lives in DNS as a TXT record. When someone receives an email claiming to [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4186,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[26],"tags":[],"class_list":["post-3573","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-authentication"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Is The SPF Record &amp; How To Implement It<\/title>\n<meta name=\"description\" content=\"In this article, we&#039;ll explore what an SPF record is &amp; how to quickly implement it in 5 simple steps - stopping your emails from going to spam\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/emailwarmup.com\/blog\/email-authentication\/spf-record\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What Is The SPF Record &amp; 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If changes don't appear after 48 hours, double-check your record syntax and ensure you're editing the correct DNS zone.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"uagb_featured_image_src":{"full":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",1348,785,false],"thumbnail":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",150,87,false],"medium":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",300,175,false],"medium_large":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",768,447,false],"large":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",1024,596,false],"1536x1536":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",1348,785,false],"2048x2048":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",1348,785,false],"profile_24":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",24,14,false],"profile_48":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",48,28,false],"profile_96":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",96,56,false],"profile_150":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",150,87,false],"profile_300":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2025\/12\/How-To-Implement-SPF-Record.png",300,175,false]},"uagb_author_info":{"display_name":"Daniyal Dehleh","author_link":"https:\/\/emailwarmup.com\/blog\/author\/daniyaldehleh\/"},"uagb_comment_info":1,"uagb_excerpt":"An SPF (Sender Policy Framework) record lists which servers can send email for your domain. The record acts as a guest list \u2014 if a server isn&#8217;t on it, receiving servers treat the email as suspicious (or reject it outright). SPF lives in DNS as a TXT record. 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