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security

CAA Records Explained: How to Restrict Which Certificate Authorities Can Issue SSL/TLS Certificates for Your Domain

CAA (Certificate Authority Authorization) records are DNS records that let you control which Certificate Authorities can issue SSL/TLS certificates for your domain. This article explains the syntax, walks through real-world examples, and shares actionable tips to avoid common pitfalls.

Aug 28, 2026 2 views

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security

DNSSEC Signing Explained: How to Protect Your Domain from DNS Spoofing and Cache Poisoning

This article explains how DNSSEC signing works, why DNS spoofing and cache poisoning are such dangerous threats, and how digital signatures create a verified chain of trust. It includes real-world attack examples and practical, step-by-step tips for enabling and monitoring DNSSEC on your own domain.

Aug 25, 2026 4 views

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dns

SPF, DKIM, and DMARC Explained: How to Set Up Email Authentication to Avoid Spam and Spoofing

Email authentication protocols SPF, DKIM, and DMARC work together to verify sender identity, protect your domain from spoofing, and keep your messages out of the spam folder. This guide explains how each protocol works, walks through a practical setup sequence, and highlights the most common mistakes so you can get your email infrastructure right the first time.

Aug 7, 2026 35 views

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security

DNS Zone Transfer Attacks: What They Are and How to Protect Your Nameserver Configuration

A DNS zone transfer attack exploits misconfigured nameservers that allow anyone to copy an entire DNS zone file via an AXFR request. This article explains how zone transfers work, why a leaked zone is dangerous, and how to lock down your nameserver configuration with IP allow-lists and TSIG authentication.

Aug 1, 2026 26 views

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security

How to Use SSHFP Records in DNS to Verify SSH Host Keys and Prevent Man-in-the-Middle Attacks

SSHFP (SSH Fingerprint) records in DNS let clients automatically verify SSH host keys before connecting, blocking man-in-the-middle attacks. This article explains how to generate and publish SSHFP records, configure clients to verify them automatically, and why combining SSHFP with DNSSEC provides strong security for remote server access.

Jul 16, 2026 108 views

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security

How to Use DANE (DNS-Based Authentication of Named Entities) to Secure Email and TLS Without Relying on Certificate Authorities

Learn how DANE (DNS-Based Authentication of Named Entities) can secure email and TLS connections without relying entirely on certificate authorities. This guide explains DANE’s mechanics, practical implementation steps for SMTP and HTTPS, and tips to reduce CA-related risk using DNSSEC-protected TLSA records.

Jul 13, 2026 65 views

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security

MTA-STS and TLS-RPT: How to Enforce Secure Email Delivery with DNS Records

MTA-STS and TLS-RPT are two DNS-based email security standards that enforce encrypted delivery and provide failure reports. This guide explains how to set them up with practical steps, policy examples, and actionable tips to protect your domain from email interception.

Jul 10, 2026 46 views

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brand-protection

How to Implement BIMI (Brand Indicators for Message Identification) to Boost Email Trust and Brand Visibility

BIMI (Brand Indicators for Message Identification) puts your brand logo right next to your emails in supported inboxes, boosting trust and click-through rates. This guide walks you through implementation prerequisites, DNS setup, and practical tips to get your logo approved and live.

Jun 28, 2026 70 views

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security

How to Perform a Domain Security Audit in 2026: Step-by-Step Guide

Domain security audits are essential in 2026 to protect your online identity from hijacking, phishing, and configuration drift. This step-by-step guide covers checking WHOIS records, DNS settings, SSL certificates, email security, and more using practical examples and free tools from Whose.Domains.

Jun 13, 2026 171 views

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security

Understanding SSL Certificate Revocation: CRLs, OCSP, and How to Verify in 2026

SSL certificate revocation is a critical but often overlooked aspect of website security. This article explains how Certificate Revocation Lists (CRLs) and the Online Certificate Status Protocol (OCSP) work, covers modern advancements like OCSP stapling and Must-Staple, and provides actionable steps to verify revocation status in 2026 using free tools and command-line checks.

Jun 7, 2026 409 views

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