{"id":5240,"date":"2026-03-09T19:56:04","date_gmt":"2026-03-09T19:56:04","guid":{"rendered":"https:\/\/emailwarmup.com\/blog\/?p=5240"},"modified":"2026-03-09T19:56:08","modified_gmt":"2026-03-09T19:56:08","slug":"how-to-fix-550-5-7-25-reverse-dns-ptr-record-failure","status":"publish","type":"post","link":"https:\/\/emailwarmup.com\/blog\/email-errors\/how-to-fix-550-5-7-25-reverse-dns-ptr-record-failure\/","title":{"rendered":"How To Fix 550 5.7.25 | Reverse DNS\/PTR Record Failure"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"3070\" height=\"1954\" src=\"https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg\" alt=\"550 5.7.25\" class=\"wp-image-5241\"\/><\/figure>\n\n\n\n<p>The 550 5.7.25 error means the receiving server rejected your email because your sending IP lacks a valid reverse DNS (PTR record), or the PTR record doesn&#8217;t match your forward DNS \u2014 also known as &#8220;reverse DNS validation failed&#8221; or &#8220;PTR record missing.&#8221;<\/p>\n\n\n\n<p>Fix it by configuring a PTR record through your hosting provider that points to your mail server&#8217;s hostname, then creating a matching A\/AAAA record that resolves back to the same IP.<\/p>\n\n\n\n<p>Major email providers (Gmail, Microsoft, Yahoo) require forward-confirmed reverse DNS (FCrDNS) for accepting mail. Missing or mismatched PTR records signal spam infrastructure \u2014 legitimate mail servers have proper DNS configuration.&nbsp;<\/p>\n\n\n\n<p>The fix requires coordination with your hosting provider, as PTR records are controlled by the IP address owner, not your domain registrar.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quick skim \u2014 550 5.7.25 error overview<\/h2>\n\n\n\n<p>The 550 5.7.25 error indicates DNS infrastructure problems rather than authentication or content issues.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Attribute<\/td><td>Details<\/td><\/tr><tr><td>Error code<\/td><td>550 5.7.25<\/td><\/tr><tr><td>Category<\/td><td>Infrastructure \/ DNS validation<\/td><\/tr><tr><td>Meaning<\/td><td>Sending IP has no PTR or FCrDNS fails<\/td><\/tr><tr><td>Severity<\/td><td>Permanent (requires DNS configuration)<\/td><\/tr><tr><td>Common causes<\/td><td>Missing PTR, hostname mismatch, IPv6 without PTR<\/td><\/tr><tr><td>Fix approach<\/td><td>Create PTR \u2192 verify A\/AAAA match \u2192 test EHLO<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What does reverse DNS failure mean?<\/h2>\n\n\n\n<p>Forward DNS maps hostnames to IP addresses (A record: mail.example.com \u2192 192.0.2.1). Reverse DNS does the opposite \u2014 it maps IP addresses to hostnames (PTR record: 192.0.2.1 \u2192 mail.example.com).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Forward-confirmed reverse DNS<\/h3>\n\n\n\n<p>Email providers require FCrDNS, meaning:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PTR record for your IP points to a hostname<\/li>\n\n\n\n<li>An A\/AAAA record for that hostname points back to the same IP<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>Step<\/td><td>Lookup<\/td><td>Result<\/td><\/tr><tr><td>1. Reverse lookup<\/td><td>192.0.2.1 \u2192 PTR<\/td><td>mail.example.com<\/td><\/tr><tr><td>2. Forward lookup<\/td><td>mail.example.com \u2192 A<\/td><td>192.0.2.1<\/td><\/tr><tr><td>3. Validation<\/td><td>IPs match?<\/td><td>\u2713 FCrDNS passes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>If the forward lookup returns a different IP (or fails entirely), FCrDNS fails, and mail gets rejected.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SMTP banner matching<\/h3>\n\n\n\n<p>Many providers also check that your SMTP greeting (EHLO\/HELO) matches the PTR hostname:<\/p>\n\n\n\n<p>EHLO mail.example.com<\/p>\n\n\n\n<p>The EHLO hostname should match what the PTR record returns. Mismatches trigger additional suspicion (though not always outright rejection).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why does this error occur?<\/h2>\n\n\n\n<p>PTR record failures typically stem from configuration gaps or hosting infrastructure limitations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Missing PTR record<\/h3>\n\n\n\n<p>Your IP address has no reverse DNS configured. Common scenarios:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Shared hosting without a dedicated IP<\/li>\n\n\n\n<li>ISP-provided IP without business mail service<\/li>\n\n\n\n<li>New VPS without PTR setup (many providers don&#8217;t configure automatically)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Hostname mismatch<\/h3>\n\n\n\n<p>A PTR record exists but points to the wrong hostname:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PTR points to the old hostname after migration<\/li>\n\n\n\n<li>PTR points to the primary hostname, but mail uses a subdomain<\/li>\n\n\n\n<li>PTR points to the hosting provider&#8217;s default (server42.hostingcompany.com)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Forward DNS missing<\/h3>\n\n\n\n<p>The PTR points to a valid hostname, but no A\/AAAA record exists for that hostname \u2014 FCrDNS fails on the return lookup.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IPv6 without PTR<\/h3>\n\n\n\n<p>Gmail often prefers IPv6 when available. If your server sends over IPv6 but only has IPv4 PTR configured:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IPv6 address has no PTR \u2192 rejection<\/li>\n\n\n\n<li>Server connects via IPv6, but you tested only IPv4<\/li>\n<\/ul>\n\n\n\n<p>This catches many senders who assume an IPv4-only configuration.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How do you fix 550 5.7.25?<\/h2>\n\n\n\n<p>PTR configuration requires access to your hosting provider&#8217;s DNS controls (not your domain registrar).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Identify your sending IP<\/h3>\n\n\n\n<p>Determine the exact IP your mail server uses for outbound connections:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check your bounce message (often includes sending IP)<\/li>\n\n\n\n<li>Review mail server logs<\/li>\n\n\n\n<li>Use online tools to send a test and capture headers<\/li>\n<\/ul>\n\n\n\n<p>For IPv6: your server may use a different IPv6 address than expected. Check \/etc\/postfix\/main.cf or equivalent for smtp_bind_address6.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Create PTR record<\/h3>\n\n\n\n<p>Contact your VPS\/hosting provider to configure reverse DNS:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DigitalOcean: Rename your droplet to the desired FQDN<\/li>\n\n\n\n<li>AWS: Request PTR via Elastic IP settings or support ticket<\/li>\n\n\n\n<li>Linode: Set reverse DNS in the networking section<\/li>\n\n\n\n<li>Traditional hosting: Submit a support ticket<\/li>\n<\/ul>\n\n\n\n<p>The PTR should point to your mail server&#8217;s fully qualified domain name (e.g., mail.yourdomain.com).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Create a matching A\/AAAA record<\/h3>\n\n\n\n<p>In your domain&#8217;s DNS (at your registrar or DNS provider):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Add an A record: mail.yourdomain.com \u2192 your.IPv4.address<\/li>\n\n\n\n<li>If using IPv6, add an AAAA record: mail.yourdomain.com \u2192 your:IPv6:address<\/li>\n<\/ul>\n\n\n\n<p>Both forward and reverse must resolve to the same IP.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Configure IPv6 PTR<\/h3>\n\n\n\n<p>If your server sends over IPv6 (check logs or disable temporarily to test):<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Identify the exact IPv6 address used for outbound SMTP<\/li>\n\n\n\n<li>Request IPv6 PTR from your hosting provider<\/li>\n\n\n\n<li>Create a matching AAAA record<\/li>\n<\/ul>\n\n\n\n<p>Alternatively, configure your mail server to prefer IPv4 for outbound connections while you sort IPv6 PTR.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Verify EHLO hostname<\/h3>\n\n\n\n<p>Your mail server&#8217;s SMTP greeting should match the PTR hostname:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check mail server configuration (myhostname in Postfix, ServerName in others)<\/li>\n\n\n\n<li>Update to match the PTR\/A record hostname<\/li>\n\n\n\n<li>Restart the mail service<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Test configuration<\/h3>\n\n\n\n<p>Use MXToolbox or command-line tools:<\/p>\n\n\n\n<p>dig -x 192.0.2.1&nbsp; &nbsp; # Should return mail.yourdomain.com<\/p>\n\n\n\n<p>dig A mail.yourdomain.com&nbsp; &nbsp; # Should return 192.0.2.1<\/p>\n\n\n\n<p>Send a test message to Gmail and check for 5.7.25 errors in the bounce or successful delivery in headers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How do you prevent the 550 5.7.25 error?<\/h2>\n\n\n\n<p>DNS infrastructure requires ongoing maintenance as your environment changes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Document IP assignments<\/h3>\n\n\n\n<p>Track which IPs your mail servers use:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primary IPv4 and IPv6 addresses<\/li>\n\n\n\n<li>Backup servers<\/li>\n\n\n\n<li>Third-party services (which have their own PTR)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Verify after infrastructure changes<\/h3>\n\n\n\n<p>Check PTR validity after:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Migrating to new hosting<\/li>\n\n\n\n<li>Adding IPv6<\/li>\n\n\n\n<li>Changing mail server hostnames<\/li>\n\n\n\n<li>IP address changes<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Test periodically<\/h3>\n\n\n\n<p>Run monthly <a href=\"https:\/\/emailwarmup.com\/email-deliverability-test\">deliverability tests<\/a> that verify PTR records remain valid. DNS changes by hosting providers (rare but possible) can break FCrDNS without warning.<\/p>\n\n\n\n\n<!-- EmailWarmup \u2014 Email Errors Campaign CTA Section -->\n<section id=\"ew-email-errors-consult\" aria-label=\"Help fixing email errors\">\n  <style>\n    \/* Scoped, theme-safe resets *\/\n    #ew-email-errors-consult, #ew-email-errors-consult *{\n      box-sizing:border-box;\n      -webkit-hyphens:none!important; -ms-hyphens:none!important; hyphens:none!important;\n      word-break:normal!important; overflow-wrap:anywhere;\n      font-family:system-ui,-apple-system,Segoe UI,Inter,Roboto,Arial,sans-serif!important;\n      color:#0f1115;\n    }\n\n    \/* Section wrapper *\/\n    #ew-email-errors-consult{\n      --radius:16px; --gap:14px;\n      --ink:#0f1115; --muted:#475569;\n      --border:#e5e7eb; --surface:#ffffff;\n\n      --tile1:#e9f0ff;\n      --tile2:#ecffd7;\n      --tile3:#efeaff;\n      --tile4:#ffe9f1;\n\n      background:\n        radial-gradient(1400px 600px at 10% -10%, #eef2ff 0%, transparent 60%),\n        radial-gradient(1400px 600px at 110% 110%, #fff7ed 0%, transparent 60%),\n        var(--surface);\n      border:1px solid var(--border);\n      border-radius:var(--radius);\n      padding:18px;\n      margin:24px auto;\n      max-width:980px;\n      box-shadow:0 8px 22px rgba(15,17,21,.06);\n    }\n\n    \/* Intro *\/\n    #ew-email-errors-consult .intro{\n      text-align:center;\n      max-width:760px;\n      margin:0 auto 16px;\n    }\n    #ew-email-errors-consult .eyebrow{\n      display:inline-block;\n      margin:0 0 8px;\n      padding:6px 10px;\n      border-radius:999px;\n      background:#eff6ff;\n      border:1px solid #dbeafe;\n      font-size:12px;\n      font-weight:800;\n      color:#1d4ed8;\n      letter-spacing:.02em;\n      text-transform:uppercase;\n    }\n    #ew-email-errors-consult .title{\n      margin:0 0 8px;\n      font-size:28px;\n      line-height:1.15;\n      letter-spacing:-.02em;\n      font-weight:900;\n      color:var(--ink);\n    }\n    #ew-email-errors-consult .subtitle{\n      margin:0;\n      font-size:15px;\n      line-height:1.6;\n      color:var(--muted);\n    }\n    #ew-email-errors-consult .subtitle a{\n      color:#2563eb;\n      text-decoration:none;\n      font-weight:700;\n    }\n    #ew-email-errors-consult .subtitle a:hover{ text-decoration:underline; 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}\n    #ew-email-errors-consult .btn:active{ transform:translateY(1px); }\n\n    @media (max-width:640px){\n      #ew-email-errors-consult .title{ font-size:24px; }\n    }\n  <\/style>\n\n  <div class=\"intro\">\n    <div class=\"eyebrow\">Need help fixing an email error?<\/div>\n    <h2 class=\"title\">Still stuck after trying the fix?<\/h2>\n    <p class=\"subtitle\">\n      Some email errors are easy to clear. Others point to deeper deliverability issues involving authentication, sender reputation, blacklisting, routing, or mailbox provider policy. If you would rather have an expert review it, speak with an\n      <a href=\"https:\/\/emailwarmup.com\/email-deliverability-consultant\">email delieverability consultant<\/a>\n      for free and we can help diagnose the issue and fix it on your behalf.\n    <\/p>\n  <\/div>\n\n  <div class=\"tiles\" role=\"list\">\n    <article class=\"tile t1\" role=\"listitem\">\n      <div class=\"icon\" aria-hidden=\"true\">\n        <svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n          <path d=\"M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z\"><\/path>\n        <\/svg>\n      <\/div>\n      <div>\n        <span class=\"h3like\">Root cause analysis<\/span>\n        <p>We look beyond the error message itself to find what is actually breaking delivery, trust, or inbox placement.<\/p>\n      <\/div>\n    <\/article>\n\n    <article class=\"tile t2\" role=\"listitem\">\n      <div class=\"icon\" aria-hidden=\"true\">\n        <svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n          <path d=\"M20 6L9 17l-5-5\"><\/path>\n        <\/svg>\n      <\/div>\n      <div>\n        <span class=\"h3like\">Technical fixes handled for you<\/span>\n        <p>From SPF, DKIM, and DMARC to blacklist cleanup, DNS alignment, and sending setup, we can guide or implement the fix.<\/p>\n      <\/div>\n    <\/article>\n\n    <article class=\"tile t3\" role=\"listitem\">\n      <div class=\"icon\" aria-hidden=\"true\">\n        <svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n          <path d=\"M12 20V10\"><\/path>\n          <path d=\"M18 20V4\"><\/path>\n          <path d=\"M6 20v-4\"><\/path>\n        <\/svg>\n      <\/div>\n      <div>\n        <span class=\"h3like\">Deliverability-first review<\/span>\n        <p>We assess whether the error is part of a bigger pattern hurting opens, replies, and overall campaign performance.<\/p>\n      <\/div>\n    <\/article>\n\n    <article class=\"tile t4\" role=\"listitem\">\n      <div class=\"icon\" aria-hidden=\"true\">\n        <svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\">\n          <path d=\"M12 12c2.8 0 5-2.2 5-5s-2.2-5-5-5-5 2.2-5 5 2.2 5 5 5z\"><\/path>\n          <path d=\"M2 22c1.5-4 5.5-6 10-6s8.5 2 10 6\"><\/path>\n        <\/svg>\n      <\/div>\n      <div>\n        <span class=\"h3like\">Free expert consultation<\/span>\n        <p>Talk to a real deliverability expert, get honest guidance, and see the next best step without pressure or upsells.<\/p>\n      <\/div>\n    <\/article>\n  <\/div>\n\n  <div class=\"bottom\">\n    <p>\n      <strong>When should you book a consultation?<\/strong> If the error keeps coming back, affects multiple mailboxes or domains, started after an ESP or DNS change, or is tied to spam placement, low inboxing, high bounce rates, or authentication failures, it is usually faster to get an expert involved early.\n    <\/p>\n  <\/div>\n\n  <div class=\"cta\">\n    <a class=\"btn\" href=\"https:\/\/emailwarmup.com\/email-deliverability-consultant\" target=\"_blank\" rel=\"noopener\">\n      Talk to a deliverability expert for free\n      <svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"currentColor\" stroke-width=\"2\" aria-hidden=\"true\">\n        <path d=\"M5 12h14\"><\/path>\n        <path d=\"M12 5l7 7-7 7\"><\/path>\n      <\/svg>\n    <\/a>\n  <\/div>\n<\/section>\n\n\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 this error:<\/p>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1773086025349\"><strong class=\"schema-faq-question\">Can I set PTR records at my domain registrar?<\/strong> <p class=\"schema-faq-answer\">No. PTR records are controlled by whoever owns the IP address block \u2014 typically your hosting provider or ISP. Your domain registrar controls forward DNS (A, AAAA, MX records) but not reverse DNS. Contact your hosting provider&#8217;s support for PTR changes.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773086032012\"><strong class=\"schema-faq-question\">Why does Gmail reject my email when other providers accept it?<\/strong> <p class=\"schema-faq-answer\">Gmail enforces PTR requirements more strictly than some providers. Additionally, Gmail often prefers IPv6 connections. If you have IPv4 PTR but not IPv6, Gmail may connect via IPv6 (which lacks PTR) while other providers use IPv4. Check which IP Gmail attempted to connect from in your bounce message.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773086039952\"><strong class=\"schema-faq-question\">How long does PTR propagation take?<\/strong> <p class=\"schema-faq-answer\">PTR changes typically propagate within minutes to hours (faster than forward DNS). However, some providers cache reverse lookups aggressively. If testing immediately after changes shows failures, wait 2-4 hours and retry.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1773086045813\"><strong class=\"schema-faq-question\">Do I need PTR for third-party email services?<\/strong> <p class=\"schema-faq-answer\">No. Services like SendGrid, Mailgun, and Google Workspace manage their own PTR records for their sending IPs. You only need PTR configuration when running your own mail server or using SMTP relay through your own infrastructure.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>The 550 5.7.25 error means the receiving server rejected your email because your sending IP lacks a valid reverse DNS (PTR record), or the PTR record doesn&#8217;t match your forward DNS \u2014 also known as &#8220;reverse DNS validation failed&#8221; or &#8220;PTR record missing.&#8221; Fix it by configuring a PTR record through your hosting provider that [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":5241,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[38],"tags":[],"class_list":["post-5240","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-email-errors"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How To Fix 550 5.7.25 | Reverse DNS\/PTR Record Failure<\/title>\n<meta name=\"description\" content=\"The 550 5.7.25 error means the receiving server rejected your email because your sending IP lacks a valid reverse DNS (PTR record). Let&#039;s fix!\" \/>\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-errors\/how-to-fix-550-5-7-25-reverse-dns-ptr-record-failure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How To Fix 550 5.7.25 | Reverse DNS\/PTR Record Failure\" \/>\n<meta property=\"og:description\" content=\"The 550 5.7.25 error means the receiving server rejected your email because your sending IP lacks a valid reverse DNS (PTR record). 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Check which IP Gmail attempted to connect from in your bounce message.","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/emailwarmup.com\/blog\/email-errors\/how-to-fix-550-5-7-25-reverse-dns-ptr-record-failure\/#faq-question-1773086039952","position":3,"url":"https:\/\/emailwarmup.com\/blog\/email-errors\/how-to-fix-550-5-7-25-reverse-dns-ptr-record-failure\/#faq-question-1773086039952","name":"How long does PTR propagation take?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"PTR changes typically propagate within minutes to hours (faster than forward DNS). However, some providers cache reverse lookups aggressively. 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You only need PTR configuration when running your own mail server or using SMTP relay through your own infrastructure.","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"uagb_featured_image_src":{"full":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",3070,1954,false],"thumbnail":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",150,95,false],"medium":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",300,191,false],"medium_large":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",768,489,false],"large":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",1024,652,false],"1536x1536":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",1536,978,false],"2048x2048":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",2048,1304,false],"profile_24":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",24,15,false],"profile_48":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",48,31,false],"profile_96":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",96,61,false],"profile_150":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",150,95,false],"profile_300":["https:\/\/emailwarmup.com\/blog\/wp-content\/uploads\/2026\/03\/550-5.7.25_11zon.jpg",300,191,false]},"uagb_author_info":{"display_name":"Daniyal Dehleh","author_link":"https:\/\/emailwarmup.com\/blog\/author\/daniyaldehleh\/"},"uagb_comment_info":0,"uagb_excerpt":"The 550 5.7.25 error means the receiving server rejected your email because your sending IP lacks a valid reverse DNS (PTR record), or the PTR record doesn&#8217;t match your forward DNS \u2014 also known as &#8220;reverse DNS validation failed&#8221; or &#8220;PTR record missing.&#8221; Fix it by configuring a PTR record through your hosting provider that&hellip;","_links":{"self":[{"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/posts\/5240","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/comments?post=5240"}],"version-history":[{"count":1,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/posts\/5240\/revisions"}],"predecessor-version":[{"id":5242,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/posts\/5240\/revisions\/5242"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/media\/5241"}],"wp:attachment":[{"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/media?parent=5240"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/categories?post=5240"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/emailwarmup.com\/blog\/wp-json\/wp\/v2\/tags?post=5240"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}