https://takao.blog/en/tags/mail/Recent content in Mail on Commentary of TakaoHugo -- gohugo.ioenCommentary of TakaoSat, 13 Jun 2026 23:11:50 +0900https://takao.blog/en/web/web-security-dnssec-spf-dkim-dmarc/Sun, 15 Feb 2026 00:00:00 +0900https://takao.blog/en/web/web-security-dnssec-spf-dkim-dmarc/<img src="https://takao.blog/img/thumnail.webp" alt="Featured image of post Domain Safety: Setting Up SPF, DKIM, and DMARC Settings" /><h2 id="introduction">Introduction </h2><p>Email authentication is essential to prevent domain spoofing, phishing, and spam folder rejection. Three DNS-based standards — <strong>SPF</strong>, <strong>DKIM</strong>, and <strong>DMARC</strong> — work together to verify that emails claiming to be from your domain are legitimate. Without these records, attackers can send forged emails on your behalf, and legitimate emails may land in recipients&rsquo; spam folders. This guide explains each standard and shows how to configure them on Cloudflare or your DNS provider.</p>