DKIM & Email Signatures Blog
Expert guides, signature details, and email security instructions to secure your domain's DKIM validation.
What is DKIM? A Complete Guide to Email Signatures
Learn how DomainKeys Identified Mail (DKIM) attaches cryptographic signatures to email headers to verify origin and prevent email tampering.
Understanding DKIM Selectors: How to Choose & Find Them
What is a DKIM selector? Learn how domains use multiple selectors to segment sending tools, and discover how to locate your active selectors.
RSA Key Length for DKIM: 1024 vs 2048 Bit Security
A security breakdown of why 2048-bit keys are the industry standard for DKIM, and why 1024-bit keys are slowly being phased out.
How to Rotate DKIM Keys Without Dropping Outbound Emails
Step-by-step guide to executing a zero-downtime DKIM key rotation using dual-signing or DNS staging, ensuring your email deliverability remains flawless.
DKIM and Third-Party Senders: Setting Up Custom Domain Signing
Learn how to configure DKIM for external platforms like Salesforce, HubSpot, or Zendesk using CNAME delegation to achieve custom domain alignment.
Common DKIM Errors: Troubleshooting Cryptographic Verification Failures
Why is your DKIM signature failing? Explore common causes like body tampering, character limits, copy-paste format issues, and DNS propagation delay.