How DKIM Works

Understand the technical details behind DKIM email authentication.

DKIM (DomainKeys Identified Mail) uses public-key cryptography to sign outgoing email. The sending server adds a digital signature to the message header, and the receiving server looks up the public key in DNS to verify the message hasn't been tampered with. Understanding how signing, verification, and alignment work helps you troubleshoot failures and make informed decisions about your email authentication setup.

What is DKIM? Email Authentication Explained

Learn what DKIM (DomainKeys Identified Mail) is, how it works to authenticate emails, and why it's essential for email deliverability and security.

How DKIM Works: Email Signing and Verification Explained

A technical deep dive into how DKIM email authentication works, including the signing process, DNS records, and verification steps.

DKIM Signature Explained: Header Tags & Format

A deep dive into the DKIM-Signature header format. Learn what each tag means, how canonicalization works, and how receivers verify signatures.

DKIM Alignment Explained: Relaxed vs Strict

Understand DKIM alignment for DMARC. Learn the difference between relaxed and strict alignment, how it affects email authentication, and when to use each mode.

DKIM for Multiple Domains: Setup and Key Management Guide

How to manage DKIM across multiple domains. Guide covering key generation, DNS setup, selector strategies, and key rotation for multi-domain email environments.

DKIM for Multiple Email Providers: Selector and Key Management

How to manage DKIM when using multiple email providers. Guide covering selector strategies, DNS record management, and avoiding conflicts between services.