Articles about DKIM

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
Email Headers DKIM

Email Headers Explained: From Received to ARC

How to read email headers: Received, Return-Path, Authentication-Results, ARC, DKIM-Signature. Complete guide to diagnosing deliverability issues.

Simon Bressier · · 3 min
DKIM Email Cryptography

Anatomy of a DKIM Signature: Every Field Explained

Complete dissection of a DKIM-Signature header: algorithm, body hash, canonicalization, selector, timestamp. Understanding the verification process step by step.

Simon Bressier · · 4 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
DKIM Email ESP

Why Do You See Two DKIM Signatures on a Single Email?

Technical explanation of dual DKIM signatures: why your ESP adds its own signature, the role of Gmail and Yahoo Feedback Loops, and the impact on DMARC alignment.

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
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