{"id":16572,"date":"2024-03-22T18:37:00","date_gmt":"2024-03-22T18:37:00","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=16572"},"modified":"2025-12-01T12:57:07","modified_gmt":"2025-12-01T12:57:07","slug":"dmarc-the-ultimate-guide","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/dmarc-the-ultimate-guide\/","title":{"rendered":"DMARC &#8211; The Ultimate Guide"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Email security breaches cost billions of dollars every year, ranging from <\/span><a href=\"https:\/\/smallbiztrends.com\/cost-of-a-data-breach\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">$50k per attack<\/span><\/a><span style=\"font-weight: 400;\"> for small businesses and <\/span><a href=\"https:\/\/retruster.com\/blog\/2019-phishing-and-email-fraud-statistics.html\"><span style=\"font-weight: 400;\">$3.86m for each phishing attack<\/span><\/a><span style=\"font-weight: 400;\"> mid size businesses. And because security breaches are growing by 11% each year, businesses are turning to Domain-based Message Authentication, Reporting &amp; Conformance (DMARC) to help stem the tide. But, how can you start using it to save your business money and grow client trust? In this ultimate guide we\u2019re walking you through everything you need to know about <a href=\"https:\/\/easydmarc.com\/blog\/glossary\/dmarc\/\">DMARC<\/a>, including what it is, how it helps you protect your business and your clients, and how you can <a href=\"https:\/\/easydmarc.com\/blog\/how-to-implement-dmarc-with-easydmarc\/\">implement DMARC<\/a>.<\/span><\/p>\n<h2><a href=\"https:\/\/easydmarc.com\/blog\/what-is-dmarc-overview\/\"><span style=\"font-weight: 400;\">What Is DMARC?<\/span><\/a><\/h2>\n<p><span style=\"font-weight: 400;\">Simply put, DMARC is an email authentication strategy that cuts down on fraudulent emails. It takes <a href=\"https:\/\/easydmarc.com\/blog\/understanding-spf-sender-policy-framework-to-improve-email-delivery\/\">Sender Policy Framework (SPF)<\/a> and Domain Keys Identified Mail (DKIM) standards to the next level by ensuring that emails reach those standards before letting them through. As a result, legitimate emails are passed through, and fraudulent emails, or emails that appear to come from your domain but actually came from an unscrupulous individual, will be blocked.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DMARC primarily works to ensure that the \u201cfrom\u201d field (sender address) setting in the header is consistent in two ways.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">First, it uses SPF to make sure that the domain matches in both \u201cheader from\u201d and the \u201cReturn-Path\u201d\u00a0\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Second, it makes sure that the domain mentioned in the \u201cheader from\u201d matches the \u201cd=domain name\u201d in the DKIM signature.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If both of them do not match, emails will not be cleared for the inbox. Furthermore, you can set up a robust <a href=\"https:\/\/easydmarc.com\/blog\/dmarc-policy-overrides\/\">DMARC policy<\/a> that tells receiving email providers how to handle your mails. Ultimately there are three options:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Accept all mails regardless of <a href=\"https:\/\/easydmarc.com\/tools\/dmarc-lookup\">DMARC lookup<\/a> has passed or failed<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Push failed mails to Spam<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Reject failed mails entirely<\/span><\/li>\n<\/ul>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-18492 size-full\" src=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/04\/image-5.png\" alt=\"DMARC deployment\" width=\"1269\" height=\"723\" srcset=\"https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/04\/image-5.png 1269w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/04\/image-5-300x171.png 300w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/04\/image-5-1024x583.png 1024w, https:\/\/easydmarc.com\/blog\/wp-content\/uploads\/2021\/04\/image-5-768x438.png 768w\" sizes=\"(max-width: 1269px) 100vw, 1269px\" \/><\/p>\n<h2><span style=\"font-weight: 400;\"><br \/>\nWhat Problems Does DMARC Solve?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Ultimately, DMARC reduces the amount of spam or fraudulent emails that may arrive at YOUR CUSTOMERS inboxes that look like they came from you.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Thus, by protecting your domain with DMARC you essentially protect your company brand and reputation.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">What Problems Does DMARC Not Solve?<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The most common misconception about DMARC is that it will reduce the amount of spam you receive in your mailbox. This is not really correct.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In fact, DMARC will reduce the amount of spoofed \/ fraudulent mails, sent on behalf of you, that your customers may receive.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">To reduce your inbound spam you need to have a good and properly configured Spam detection system.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DMARC doesn\u2019t stop all kinds of phishing attacks, so users will always need to be wary of requests for personal information. Most reputable companies won\u2019t contact you via email to ask for things like credit card details, bank information, passwords, or social security numbers. And, a <a href=\"https:\/\/easydmarc.com\/blog\/what-is-dmarc-overview\/\">DMARC protocol<\/a> will prevent spoofing of domains you trust like \u201cmybank.com.\u201d<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, where a lot of phishing attacks find success is in \u201clook-a-like\u201d domains. Using the example above, they might not send it from \u201cmybank.com,\u201d but might send from \u201cmybank.us\u201d or \u201cmybanks.com\u201d or domains that look a lot like the domain you\u2019re expecting the email to be from. Spammers are often sophisticated and spoof the normal message signatures, so the email looks almost identical to one from the real company.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Another common practice for these fraudulent emails is to direct you to a link at a spoofed website. At the \u201clooks like\u201d domain where you may pay a fraudulent invoice, give them a password, or enter other personal information.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As a result, consumers will always need to be aware of potentially problematic emails. And instead of replying to that email to confirm legitimacy, they should look up the real phone number online and call their contact directly.\u00a0<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Why You Need DMARC<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">When fraudulent emails make it to customer inboxes, there are all kinds of inherent dangers, from identity theft to outright theft of money or other information. This is particularly troubling when the emails appear to come from someone trustworthy, whether your bank, the IRS, or even a business partner. <\/span><\/p>\n<p><span style=\"font-weight: 400;\">The chief benefits boil down to:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Brands can let everyone know they are following good email authentication practices, which builds trust with your clients, but also creates a red flag to would-be fraudsters that your brand is more difficult to spoof and they should move on to easier targets.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Domain owners are able to receive feedback about addresses using their domain to send email.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Brands can set guidelines for what will happen to emails that do not pass muster.<\/span><\/li>\n<li style=\"font-weight: 400;\"><span style=\"font-weight: 400;\">Consumers can have confidence that the person sending the email from your brand is who they say they are.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Basically, you can think of DMARC as the ultimate traffic cop for your customers inboxes. DMARC\u2019s main goal is to make sure that people are following your rules. <\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Myths About DMARC<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Now that we\u2019ve laid out what DMARC is and why you need it, it\u2019s time to dispel some of the top DMARC myths.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Myth #1: DMARC Blocks All Email Attacks<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Although we briefly explained this in the section above \u201cWhat does DMARC not solve?\u201d we can go into more of the specifics here. A well-configured DMARC protocol will ensure that email receivers can tell whether an email came from the actual person at your domain sending it, or whether it was sent by someone with ill intentions.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The important words here are \u201cat your domain.\u201d It helps protect consumers from emails that are spoofed. In other words, their email service provider will be able to detect that the emails were spoofed, and although they appear to originate from your domain, they are fraudulent.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DMARC, however, does not protect against \u201clook alike\u201d phishing schemes. There\u2019s a big difference here. If an email from <\/span><b>sales@yourdomain.com<\/b><span style=\"font-weight: 400;\"> is sent by a fraudster and you have a\u00a0 properly configured DMARC protocol in place, the email service provider will either quarantine or reject that email. However, if the email comes from <\/span><b>sales@someotherdomain.com<\/b><span style=\"font-weight: 400;\">, then the email service provider won\u2019t be able to tell if the mail was sent from a legitimate source or not.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Similarly, if a password is compromised and someone hacks into your actual email server, DMARC alone won\u2019t solve the phishing problem.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Myth #2: Setting up DMARC Automatically Protects You<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">DMARC is one of the most widely recognized <a href=\"https:\/\/easydmarc.com\/blog\/what-is-email-encryption-how-to-encrypt-email-and-how-does-it-work\/\">email security protocols<\/a> worldwide, to the tune of billions of email addresses that support it. So when you <a href=\"https:\/\/easydmarc.com\/tools\/dmarc-record-generator\">create a DMARC record<\/a>, not only is it a commonly accepted strategy, but it should protect you, right?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The truth is that setting up a DMARC record is only part of the equation. Although it gives email recipients the information they need to verify your domain, it doesn\u2019t get you all the way to the finish line. to gain the protection of a DMARC strategy, you need to specify what you want to do with any emails that don\u2019t pass muster. So if you want questionable emails to be quarantined or rejected, you\u2019ll need to make sure your record indicates this. A staggering majority of brands that employ DMARC don\u2019t set up a policy for what to do with those emails. So they are not protected as well as they could be by updating this setting.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Myth #3: You Only Need DMARC if You Send Emails From Your Domain<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">It\u2019s easy to see why you might think this. After all, if you\u2019re not sending emails from a domain, you don\u2019t need to worry about whether you\u2019re being impersonated, right?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The hard truth is that hackers can spoof any domain, regardless of if it\u2019s being used to send emails. So to truly protect your brand, you need to set up DMARC for all of your domains. Furthermore, if there\u2019s a chance you ever might want to send emails from a particular domain, you will want to ensure that you\u2019re not starting out fighting your way back from a bad domain reputation.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Myth #4: DMARC is a Great Set and Forget Solution to Email Security<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">You\u2019ve got your <a href=\"https:\/\/easydmarc.com\/blog\/e-zorg-spf-and-dkim-configuration\/\">SPF and DKIM policies configured<\/a>, and your DMARC protocols are set up. Time to kick back and relax about your email security from here on out, right?<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Not exactly. Realistically, that\u2019s just the first step. Long term, you\u2019ll need to make sure to stay up on your email security and the IP addresses your third party SaaS apps are using. Anytime you make a change to your <a href=\"https:\/\/ecommerce-platforms.com\/articles\/email-marketing-services\">email marketing service<\/a> or you register a new domain, your DMARC policies will, at a minimum, need to be re-examined. More likely, they\u2019ll need to be updated. Moreover, how will you monitor the data from your DMARC reports and fight back against any fraudsters that attempt to spoof your domain? That\u2019s where a <a href=\"https:\/\/easydmarc.com\/\">DMARC managed service like EasyDMARC<\/a> is an ideal solution for your company.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Myth #5: DMARC is Easy to Implement<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">All you have to do to <a href=\"https:\/\/easydmarc.com\/blog\/how-do-i-set-up-dmarc-without-tech-support\/\">set up DMARC<\/a> is to add a record to your domain DNS settings, then identify an email to send the records to, right? Well, sort of. Although correct , unfortunately, the reality is that it\u2019s not so simple unless you really know what you\u2019re doing.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Truthfully, that\u2019s the beauty of a <a href=\"https:\/\/easydmarc.com\/\">managed DMARC service like EasyDMARC<\/a>. They make it easy for brands because we manage the headache for you. After all, not only can the reports be tough to understand, but it\u2019s not always easy to compare IP addresses with the individuals sending legitimate emails from your domain. You likely don\u2019t realize how intricate your email system is. Especially if you have multiple domains and SaaS integrations, and potentially more than one email service provider.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Furthermore, when you <a href=\"https:\/\/easydmarc.com\/blog\/arlo-spf-and-dkim-configuration\/\">set up your SPF and DKIM protocols<\/a>, you\u2019ll need to factor all of this information, as well as the associated IP addresses, to implement everything successfully.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">How to Add DMARC Step by Step<\/span><\/h2>\n<h3><span style=\"font-weight: 400;\">Step 1: Configure Your SPF<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">DMARC requires <a href=\"https:\/\/easydmarc.com\/blog\/chargebee-spf-and-dkim-configuration\/\">SPF and DKIM<\/a> to work, so the first place to start is by setting up your SPF. Before you get started, you\u2019ll want to make sure you know your IP address.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Then, open your DNS settings and create a new txt record:\u00a0<\/span><\/p>\n<blockquote><p><em><span style=\"font-weight: 400;\">v=spf1 a mx ip4:xxx.xxx.xxx.xxx -all<\/span><\/em><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">Save the settings. It may take an hour for the settings to take effect.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">From there, you\u2019ll want to check your SPF record in your DNS to make sure that it\u2019s set up correctly.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Step 2: Configure Your DKIM<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">When you use an external email service, they may have a feature to help you <a href=\"https:\/\/easydmarc.com\/blog\/klaviyo-spf-and-dkim-setup-step-by-step\/\">set up DKIM<\/a>. <\/span><span style=\"font-weight: 400;\">Follow their steps, and then as part of their domain authentication protocol, they may give you some additional DNS records. <\/span><span style=\"font-weight: 400;\">Just like when you set up SPF, add a new txt record for each key they give you, and publish them following their directions.\u00a0 <\/span><span style=\"font-weight: 400;\">You\u2019ll need to do this for every 3rd party you use to send emails.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Once again, it may take an hour to take effect, so check to confirm they\u2019re set up properly before moving forward.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Step 3: Publish Your DMARC Record<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">You\u2019ve already <a href=\"https:\/\/easydmarc.com\/blog\/netsuite-spf-and-dkim-configuration\/\">set up SPF and DKIM<\/a>, so now you\u2019re ready to configure your DMARC. <\/span><span style=\"font-weight: 400;\">Go back to your DNS settings, and create a new txt record.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For the value, you\u2019ll want to use:<\/span><\/p>\n<blockquote><p><em><span style=\"font-weight: 400;\">\u201c<a href=\"https:\/\/easydmarc.com\/blog\/what-is-a-dmarc-policy\/\">v=DMARC1; p=none;<\/a> rua=mailto:email@easydmarc.com\u201d<\/span><\/em><\/p><\/blockquote>\n<p><span style=\"font-weight: 400;\">The value for v will never change; it should always be DMARC1.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The value for p is what you want email servers to do with emails that don\u2019t pass your DMARC protocol.\u00a0<\/span><\/p>\n<ul>\n<li><span style=\"font-weight: 400;\">p=none no action to be taken<\/span><\/li>\n<li><span style=\"font-weight: 400;\">p=quarantine (or to send to spam)<\/span><\/li>\n<li><span style=\"font-weight: 400;\">p=reject completely<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">To fully protect your domain, you\u2019ll want to set either q or r. However, if you are just starting out, you may be better served to choose none until you verify that everything is working properly.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The value for RUA is the email address where you want to receive reports about your email performance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Once you\u2019ve built the record, click publish. Again, you may need to wait an hour for the settings to take effect.<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Step 4: Review the Reports to Confirm Settings<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Now wait for the <a href=\"https:\/\/easydmarc.com\/blog\/understanding-dmarc-reports\/\">DMARC reports<\/a> to start rolling in and start checking them out to gauge your email performance.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As we mentioned above, understanding the reports isn\u2019t always easy. That\u2019s where it may be helpful to employ a managed DMARC service like EasyDMARC as an extension of your team. We will put the highly technical report into a format you can easily understand. We\u2019ll take care of all the hairy details for you too, making it a truly painless effort for you!<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Step 5: Monitor Your Emails<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Check to ensure that all of your emails are authentic and reaching their target audience. Be sure to monitor to confirm that your <a href=\"https:\/\/easydmarc.com\/blog\/34sp-spf-and-dkim-configuration\/\">SPF and DKIM<\/a> settings are correct. If you\u2019re finding errors, go back in and make sure that they are configured correctly in your DNS.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you think you\u2019ll need help with this, it\u2019s a good idea to work with a managed solution like EasyDMARC from the get-go. We\u2019ll help <a href=\"https:\/\/easydmarc.com\/blog\/ebook\/dmarc-security-guide-for-isps-and-telecommunication-companies\/\">guide<\/a> you into what needs fixing and adjusting. In fact, with less than 20 minutes, we can move your email protection into the strong range.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Once your email settings appear to be working correctly for a few months, it\u2019s a good time to update your DMARC record to the quarantine setting (\u201cq\u201d). And, once again, after that\u2019s working properly for several months, you can update this setting to reject (\u201cr\u201d).\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The reason you\u2019ll want to take a tiered approach to adjust this setting is to make sure that no emails are falsely marked as legitimate and vice versa.\u00a0<\/span><\/p>\n<h3><span style=\"font-weight: 400;\">Step 6: Continued Monitoring<\/span><\/h3>\n<p><span style=\"font-weight: 400;\">Although your set up is complete, DMARC isn\u2019t a set it and forget it solution. It\u2019s important to keep monitoring your emails and your reports to make sure that everything is working properly. Moreover, as your organization grows and changes or starts working with new email providers, you\u2019ll need to revisit your settings to ensure optimal email delivery.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">Other Considerations You Should Make Regarding DMARC<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Just as you must set up DNS records as you configure your <a href=\"https:\/\/easydmarc.com\/blog\/klaviyo-spf-and-dkim-setup-step-by-step\/\">SPF and DKIM records<\/a>, you must also have reverse DNS records. This ultimately gives email service providers a way to compare your IP address to your hostname, making them less likely to block your email.<br \/>\nCheck out <a href=\"https:\/\/easydmarc.com\/pricing\/easydmarc\/businesses\">easyDMARC pricing<\/a>.<\/span><\/p>\n<h2><span style=\"font-weight: 400;\">The Bottom Line<\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Employing DMARC protocols is an absolute must to stay ahead today as a brand. Beyond that, you must take the time to do it the right way. Anything less potentially means less consumer trust, fewer delivered emails, and a spoofed domain that damages your brand and your clients\u2019 security.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, as busy as you and your team are, adding \u201cone more thing\u201d to your to-do list can be tough to stomach, so when you need to find a way to understand reports that aren\u2019t in plain English. If this sounds like you, then working with a service like <\/span><a href=\"https:\/\/easydmarc.com\/\"><span style=\"font-weight: 400;\">EasyDMARC<\/span><\/a><span style=\"font-weight: 400;\"> is the perfect solution to help prevent phishing and fraud while maintaining your clients\u2019 trust and your brand\u2019s reputation.<\/span><\/p>\n<p style=\"text-align: center;\"><a class=\"maxbutton-5 maxbutton maxbutton-check-your-domain\" href=\"https:\/\/easydmarc.com\/tools\/domain-scanner\"><span class='mb-text'>Check Your Domain<\/span><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Email security breaches cost billions of dollars every &#8230;<\/p>\n","protected":false},"author":1,"featured_media":31711,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[204,285,203],"tags":[],"class_list":["post-16572","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-dmarc","category-email-security"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>DMARC - The Ultimate Guide | EasyDMARC<\/title>\n<meta name=\"description\" content=\"DMARC - The ultimate guide. 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