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spf, dkim, dmarc, and the sinking feeling when the test mail lands in spam.
2 blog posts.
Blog posts
Four DNS records that close the entire phishing-impersonation class: SPF, DKIM, DMARC, and CAA, plus two monitors, set up correctly in one afternoon.
Self-hosted SimpleLogin with Docker, Postfix, and Brevo for $3/month. The TLS gotcha that ate two hours of my Sunday, written down so you skip it.