{"id":9654,"date":"2025-08-01T15:28:57","date_gmt":"2025-08-01T13:28:57","guid":{"rendered":"https:\/\/www.efidem.com\/?p=9654"},"modified":"2026-01-13T16:26:27","modified_gmt":"2026-01-13T15:26:27","slug":"dkim-email-signature-security","status":"publish","type":"post","link":"https:\/\/www.efidem.com\/en\/blog\/2025\/08\/01\/dkim-email-signature-securite\/","title":{"rendered":"DKIM: Domain Keys Identified Mail"},"content":{"rendered":"
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DKIM: What is it and why implement it to secure your e-mail deliveries?<\/p>\n

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In the world of digital marketing and email communication, deliverability and security are major issues. To ensure that your messages actually arrive in your recipients' inboxes - and not in the spam folder - the implementation of authentication mechanisms becomes essential. At Efidem<\/a>, we favor one of the most effective and widespread, the DKIM<\/strong>, for DomainKeys Identified Mail<\/strong>.<\/p>\n

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What is DKIM?<\/h2>\n

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The DKIM signature<\/strong> is an authentication protocol that allows a domain to add a digital signature<\/strong> to the emails it sends. Whether you send your messages via\u00a0API<\/a>\u00a0or in manual mode via Snapshoot<\/a>, This signature is inserted into the message header when the message is sent. On receipt, the receiving server can then check that the message has not been altered in transit, by comparing the signature with the original. public key<\/strong> published in the DNS of the sending domain.<\/p>\n

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In practical terms, this means that a domain (e.g. : your-company.com<\/code>) can prove that he or she is the author of an e-mail, and that it has not been altered in transit. This is a sign of confidence not only for email providers (Gmail, Outlook, Yahoo...), but also for your recipients.<\/p>\n

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Why implement DKIM in your emailing strategy?<\/h2>\n

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1. Improve deliverability<\/strong> your emails<\/h3>\n

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By signing your e-mails with a DKIM-signature, you show e-mail providers that you are a reliable sender. This authentication enables you to reduce the risk of spam classification<\/strong>. Coupled with other protocols such as SPF and DMARC, DKIM plays a central role in optimizing your sending reputation. To set it up, follow these instructions on this page<\/a>.\u00a0<\/p>\n

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2. Guarantee the\u2019integrity<\/strong> your messages<\/h3>\n

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Thanks to the DKIM signature and the DKIM key, the content of the email is protected: any modification between sending and receiving (for example by a malicious actor or a\u00a0SMTP relay<\/a>\u00a0compromise) would invalidate the signature. This ensures that the message read by the recipient is exactly the one you sent.<\/p>\n

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3. Protect yourself against spoofing<\/strong> and identity theft<\/h3>\n

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Visit spoofing email<\/strong> consists of sending messages by impersonating a trusted sender (such as a bank, a customer service department or a brand). By implementing this signature, you considerably reduce the risk of your domain being used for phishing attacks without your knowledge. This strengthens the security of your communications and protects your brand image.<\/p>\n

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4. Strengthen trust<\/strong> of your customers<\/h3>\n

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By securing your e-mails with SPF and DKIM registration, you give your recipients a strong signal that your company takes communication security seriously. This can be particularly important for sensitive messages, such as order confirmations, sales reminders or electronic invoices.<\/p>\n

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How does DKIM authentication work technically?<\/h2>\n

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Here is a summary of how it works:<\/p>\n

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        1. You generate a pair of keys<\/strong> (one private, one public).<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

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            1. Visit private key<\/strong> is used by your sending server to sign emails.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

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                1. Visit public key<\/strong> is published in your domain's DNS, accessible by any receiving server.<\/li>\n<\/ol>\n<\/li>\n<\/ol>\n

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                    1. When an email is received, the recipient's server :\n