{"id":30636,"date":"2022-10-18T08:50:06","date_gmt":"2022-10-18T08:50:06","guid":{"rendered":"https:\/\/easydmarc.com\/blog\/?p=30636"},"modified":"2026-03-17T19:02:41","modified_gmt":"2026-03-17T19:02:41","slug":"how-does-dkim-improve-deliverability","status":"publish","type":"post","link":"https:\/\/easydmarc.com\/blog\/how-does-dkim-improve-deliverability\/","title":{"rendered":"How Does DKIM Improve Deliverability?"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">If you&#8217;re aiming to learn <\/span><b>how to improve email deliverability<\/b><span style=\"font-weight: 400;\">, you need to understand how email filters work. They&#8217;re the first line of defense in any inbox, promptly blocking messages that appear to be fake or spam.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unfortunately, there&#8217;s no secret code to bypass email filters. Each email service provider (ESP) uses different settings. But it\u2019s not only the filters that hinder your deliverability rates. Domain reputation, content quality, and other factors play major roles too.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">We\u2019ll leave all other factors aside and focus on email authentication for<\/span><b> improving deliverability of emails.<\/b><span style=\"font-weight: 400;\"> We\u2019ve already talked about SPF as the <\/span><a href=\"https:\/\/easydmarc.com\/blog\/spf-start-your-journey-toward-dmarc-compliance\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">first step toward DMARC compliance<\/span><\/a><span style=\"font-weight: 400;\">. Now it\u2019s time to dive into DKIM (DomainKeys Identified Mail).<\/span><\/p>\n<h2><b>So, What&#8217;s the Problem with Deliverability?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">There are plenty of issues plaguing your deliverability rates. Emails get lost in transit or end up in the lonely \u201cSpam\u201d folder all the time. You can build up an incredible mail list database, but if you don\u2019t send emails frequently, your messages could be diverted by spam blockers. Other notable challenges that may affect deliverability rates include the following:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A single opt-in system is also problematic since your messages can be flagged as erroneous signups or spambots.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sending a massive email campaign from a free domain is likely to enable spam filters.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Using spam flagging subject lines can divert all your messages to the spam folder or block them immediately.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">ESPs can also flag messages with a heavy load of HTML resources, such as images and links. It\u2019s why most commercial emails use a single template, including everything they have to say.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">URL shorteners are a big no-no since ESPs can flag these shortened links as malicious.\u00a0<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Making opt-out difficult can cause people to manually flag your emails for being problematic.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Implementing DMARC is the best way to protect your domain and ensure better deliverability rates. It\u2019s an email authentication standard that essentially tells recipient mail servers to block any emails from sources you haven\u2019t authorized. As such, spam, spoof, and phishing emails using your company\u2019s domain name aren\u2019t delivered, and only legitimate emails are.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Without email authentication, you can\u2019t prove that <\/span><i><span style=\"font-weight: 400;\">your<\/span><\/i><span style=\"font-weight: 400;\"> emails are genuine so spam filters can block them. Fraudulent emails might also go through, which isn\u2019t good for your company\u2019s domain reputation. But to <\/span><a href=\"https:\/\/easydmarc.com\/blog\/how-to-implement-dmarc-with-easydmarc\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">implement DMARC<\/span><\/a><span style=\"font-weight: 400;\">, you need to properly <a href=\"https:\/\/easydmarc.com\/blog\/configuration-of-spf-and-dkim-for-emarsys\/\">configure SPF and DKIM first<\/a>.<\/span><\/p>\n<p><a href=\"https:\/\/easydmarc.com\/blog\/what-is-a-dkim-record\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DKIM<\/span><\/a><span style=\"font-weight: 400;\"> and <\/span><a href=\"https:\/\/easydmarc.com\/tools\/spf-lookup\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">SPF<\/span><\/a><span style=\"font-weight: 400;\"> are separate authentication protocols used together with DMARC to help recipient servers validate and authenticate emails.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The difference between <\/span><span style=\"font-weight: 400;\">DKIM vs. SPF<\/span><span style=\"font-weight: 400;\"> lies in its function and purpose. DKIM uses a cryptographic key pair, one public and one private, to link an email to its domain and ensure a message wasn\u2019t altered in transit.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Conversely, the SPF (Sender Policy Framework) protocol allows you to define precisely which sending sources are authorized to send emails from your domain.<\/span><\/p>\n<h2><b>Why Email Authentication is a Reliable Way to Improve Deliverability<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">If we have to explain the advantages of email authentication in a nutshell, it would be with a single word: visibility. By <\/span><a href=\"https:\/\/easydmarc.com\/blog\/dkim-record-how-to-create-add-and-check-dkim-records\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">adding a DKIM record to your DNS<\/span><\/a><span style=\"font-weight: 400;\">, your recipients know your messages originate from you and haven\u2019t been tampered with during transit. This verifies every single email you send, lowering the chances of being blocked by email filters. Once you configure a <\/span><a href=\"https:\/\/easydmarc.com\/blog\/what-is-a-dkim-signature\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DKIM signature<\/span><\/a><span style=\"font-weight: 400;\"> for your domain, you&#8217;ll see how quickly <\/span><b>DKIM can improve deliverability<\/b><span style=\"font-weight: 400;\"> rates.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The verification standard used by many big companies to authenticate messages is known as DMARC (short for Domain-Based Message Authentication, Reporting, &amp; Conformance).<\/span><span style=\"font-weight: 400;\"> DMARC vs. DKIM<\/span><span style=\"font-weight: 400;\"> enhances and builds upon the protection and authentication offered by both DKIM and SPF.s.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DKIM verifies the authenticity of an email. SPF allows you to define the authorized IP addresses permitted to send messages from a particular domain.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Both systems work in tandem to prevent anyone from spoofing your domain. DMARC effectively blocks bad actors from delivering spoofed, spam, or phishing emails to unsuspecting recipients using your domain or company\u2019s name&#8230;\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As you take further steps to learn <\/span><b>how to improve email deliverability<\/b><span style=\"font-weight: 400;\">, you&#8217;ll realize that <\/span><a href=\"https:\/\/easydmarc.com\/blog\/ignoring-email-authentication-will-cost-you-time-and-sales\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">email authentication<\/span><\/a><span style=\"font-weight: 400;\"> does wonders to prove that you are who you say you are online. ESPs will know you\u2019re a legitimate sender and your emails will have a higher chance of landing in your recipients\u2019 inboxes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Remember, deliverability rates depend on various factors, so email best practices are still vital.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Still, if you want to <\/span><b>improve email deliverability <\/b><span style=\"font-weight: 400;\">while protecting your domain, DMARC implementation is a must, requiring proper <a href=\"https:\/\/easydmarc.com\/blog\/mailup-spf-and-dkim-cofngiuration\/\">SPF and DKIM configuration<\/a>. With DMARC in place, ESPs will know instantly you&#8217;re a trusted sender.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DKIM is mandatory for many companies such as Yahoo! and Google because of their feedback loop policies. These policies keep track of spam complaints, and their algorithm is fed each time someone flags a message as spam.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Without DKIM, you can\u2019t keep track of spam complaints at such companies and spam emails can\u2019t be automatically blocked. This could, in turn, lead to your domain being blocked or blacklisted by email service providers&#8230;<\/span><\/p>\n<h2><b>What Does DKIM Add to Improving Email Deliverability?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The road to improving email deliverability requires DKIM. While it\u2019s not the only protocol you\u2019ll need, it\u2019s a solid step in the right direction. It\u2019s a critical standard on the way to full DMARC compliance, which requires SPF setup as well.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">While it\u2019s not the only protocol to consider, DKIM adds a lot of value to your email infrastructure. DKIM informs every email service provider you&#8217;re sending legitimate messages. This happens because of the digital signature imprinted in the header of all your messages.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As mentioned, DKIM uses a pair of cryptographic keys. The public key is published in the <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dkim-record-generator\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DKIM record<\/span><\/a><span style=\"font-weight: 400;\"> while the private key is used to generate an encrypted digital signature for each email sent from your domain.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">ESPs validate the signature against the public key found in your domain&#8217;s DNS records. You can easily publish your key in a TXT record using EasyDMARC&#8217;s <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dkim-record-generator\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DKIM record generator<\/span><\/a><span style=\"font-weight: 400;\"> tool. If you&#8217;re unsure whether you have a DKIM record, you can always use EasyDMARC&#8217;s <\/span><a href=\"https:\/\/easydmarc.com\/tools\/dkim-lookup\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DKIM lookup tool<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Once you&#8217;ve made sure DKIM is properly configured, any message you send generates a unique signature. Inbound mail servers use the public key to decrypt and compare the signature. If the values match, the message proves authentic and unaltered. This guarantees a soft landing without issues.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The process is relatively easy to manage, but it still needs fine-tuning for all <\/span><a href=\"https:\/\/easydmarc.com\/blog\/what-is-a-dmarc-policy\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">DMARC policies<\/span><\/a><span style=\"font-weight: 400;\"> and tags to work correctly. Remember that an exemplary DMARC configuration will issue reports indicating the status of every message sent and if it passed verification. These reports also indicate the performance of DKIM signatures. You&#8217;ll see if they pass, fail, or are rejected based on another issue.<\/span><\/p>\n<h2><b>Final Thoughts<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">So, <\/span><b>does DKIM improve deliverability<\/b><span style=\"font-weight: 400;\">? The final answer is yes, but it takes effort to get to the perfect point where email service providers verify all your messages. DKIM alone doesn&#8217;t do all the work, but it handles a lot of heavy lifting in the verification process.\u00a0<\/span><\/p>\n<p><span style=\"font-weight: 400;\">DKIM is important for DMARC authentication, along with SPF.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Once you implement DMARC, you can evaluate the performance of your email authentication measures. This will help you make any necessary changes to improve email deliverability rates. Rest assured, once you <\/span><a href=\"https:\/\/easydmarc.com\/blog\/dkim-record-how-to-create-add-and-check-dkim-records\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-weight: 400;\">add a DKIM record to your DNS<\/span><\/a><span style=\"font-weight: 400;\">, you&#8217;ll be one step closer to DMARC compliance.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you&#8217;re aiming to learn how to improve &#8230;<\/p>\n","protected":false},"author":1,"featured_media":31833,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[204,295,203],"tags":[],"class_list":["post-30636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-deliverability","category-email-security"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How Does DKIM Improve Deliverability? | EasyDMARC<\/title>\n<meta name=\"description\" content=\"Discover how DKIM improves email deliverability by ensuring message integrity and trustworthiness. 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