Articles about DNS

6 articles

DNS Email SPF

Email and DNS: Every Record You Need to Know

Complete guide to email-related DNS records: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, PTR. Each record explained with concrete examples.

Simon Bressier · · 4 min
DMARC Email Security

Reading and Understanding DMARC Reports (RUA)

Practical guide to interpreting DMARC aggregate reports: XML format, legitimate vs suspicious sources, shadow IT, and how to use the data to strengthen your policy.

Simon Bressier · · 3 min
DKIM Security Cryptography

DKIM RSA Key Size: 1024 vs 2048 Bits and the Future with Ed25519

Why your DKIM key size matters: history of RSA 512/768/1024-bit vulnerabilities, migration to 2048 bits, and Ed25519 as the future standard.

Simon Bressier · · 3 min
DMARC Email Security

How to Configure DMARC to Protect Your Domain

Complete guide to setting up a DMARC record on your domain: syntax, policies, RUA reports and best practices.

Simon Bressier · · 3 min
DKIM Email Security

DKIM: Sign Your Emails to Prove Their Authenticity

Complete guide to DKIM (DomainKeys Identified Mail): how cryptographic signatures work, DNS setup, key rotation and troubleshooting.

Simon Bressier · · 4 min
SPF Email DNS

SPF: The Complete Guide to Authorizing Your Sending Servers

Everything you need to know about SPF (Sender Policy Framework): syntax, mechanisms, the 10 DNS lookup limit, and step-by-step configuration.

Simon Bressier · · 3 min
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